Logged Visits:

16th Jan 2023  14:51  by Trigobsession

FB Number: Not logged  Condition: Moved  Score: 6/10

Easy to find and easy to walk to.

10th Sep 2022  07:37  by Trigger monster

FB Number: Not logged  Condition: Good  Score: 8/10

When planning route for the day found out about this significant location so it was included. Tricky parking as others have said but easy to access. Shame about the litter. It’s in a small area of maintained grass and bushes but looked a bit messy at the time. Historic. It needs more research to understand what a base line is. The thought of measuring 27404 feet is mind boggling. Is that how far it is to Greenwich from this spot?

Hounslow Canon and plaque
Hounslow Plaque
Hounslow Looking towards the runway

14th May 2022  14:13  by Moacky

FB Number: Not logged  Condition: Good  Score: 9/10

Tranquil spot - at least as tranquil as it gets around here!

©Moacky

15th Dec 2021  13:43  by painterman61

FB Number: Not logged  Condition: Moved  Score: 8/10

Quick park up historic cannon surreal having planes taking off every 2 minutes 200 metres away.

Cannon ©painterman61
Top ©painterman61
Plaque ©painterman61
Life in the fast lane ©painterman61

25th Oct 2020  08:09  by thejackrustles

FB Number: Not logged  Condition: Moved  Score: 10/10

Nice early morning walk to this from the Holiday Inn. 10 for historical significance!

Hounslow Heath Baseline North-west collage ©thejackrustles

23rd Aug 2020  14:40  by COVID Trig Point Challenge

FB Number: Not logged  Condition: Good  Score: 8/10

Tucked away in the corner off of the turning to Nene roundabout. Easily accessible.

4th Aug 2019  07:07  by Trigger

FB Number: Not logged  Condition: Good  Score: 5/10

TP7816

27th Jun 2019  12:15  by RAH

FB Number: Not logged  Condition: Moved  Score: 4/10

A drive past, twice, today as I couldn’t find anywhere to park. I’d just driven up from the SE marker cannon.

12th May 2019  17:20  by 1473

Gridref: TQ 07716 76799   FB Number: Not logged  Condition: Moved  Score: 7/10

Finally got this one by parking early for my flight and walking over.

©1473

29th Jun 2018  11:20  by Ted Mariner

FB Number: Not logged  Condition: Good  Score: 8/10

8 out of 10 for historical significance. Parked 5 minutes away surrounded by signs threatening tickets, clamps and being towed away. Scampered across the Bath Road and located the canon and plaque easily. I visited this trig many years ago before the present level of development at Heathrow, hopefully it will remain safe for many years to come.

Cannon and plaque

17th Jun 2018  07:13  by TrigJS

Gridref: TQ 07714 76791   FB Number: Not logged  Condition: Moved  Score: 7/10

The other end of the Hounslow baseline. Cannon in good condition but apparently moved from original location. Parking nearby not easy so left car near to the Heathrow employment and skills academy and it was a 5 minutes walk from there.

TP7816 The cannon.
TP7816 The plaque.

20th Mar 2018  16:00  by Tikal

FB Number: Not logged  Condition: Good  Score: 5/10

Pleased to find this historical location while staying at a nearby hotel

27th Mar 2017  11:22  by Ant1974

FB Number: Not logged  Condition: Good  Score: 5/10

25th Aug 2016  16:22  by lonesome_cowboy_burt

Gridref: TQ 07713 76792   FB Number: Not logged  Condition: Moved  Score: 7/10

Just outside a large car park, in good condition. Now logged as moved from the south side of the Northern Perimeter Road to a location very close to TP23814 - Kings Arbour

28th Sep 2015  20:15  by bluebeard

FB Number: Not logged  Condition: Good  Score: 10/10

11th May 2015  11:16  by Trigbagger

FB Number: Not logged  Condition: Good  Score: 10/10

Staying at the Ibis hotel nearby for the annual Army v Navy rugby match at Twickers. Couldn't resist hunting this out before going home as it was so close.

7th Dec 2014  10:13  by jonglew

Gridref: TQ 07715 76790   FB Number: Not logged  Condition: Moved  Score: 7/10

High points for historical value, but is it a trig? Not listed in the OS database, but suppose it gets the benefit of the doubt. The given GR is around 70m out. Cannon, with memorial plaque, is located on N side of the Northern Perimeter Road.

Cannon TP7816©jonglew
Cannon TP7816©jonglew
Memorial Plaque TP7816©jonglew

10th Jul 2013  08:20  by peregrinus

FB Number: Not logged  Condition: Good  Score: 5/10

Bagged from the X26 bus, conspicuous white cannon projecting above plantings.

27th Aug 2012  11:30  by arranc

Gridref: TQ 07715 76794   FB Number: Not logged  Condition: Good  Score: 10/10

N side of North Perimeter Road, south of Nene Roundabout. Must have been moved, as given grid ref is inside the airport perimetre fence. My grid ref is the same as for CJO and pog.

26th Aug 2012  08:50  by Mickandkim

Gridref: TQ 07693 76719   FB Number: Not logged  Condition: Good  Score: 6/10

Easy find on grass area on hotel side of road

5th Jul 2012  15:01  by sky high boys

FB Number: Not logged  Condition: Good  Score: 7/10

Hours and hours to spare at Heathrow, interesting wee diversion to find my second cannon.

25th May 2012  23:10  by CJO

Gridref: TQ 07715 76793   FB Number: Not logged  Condition: Good  Score: 7/10

Arrived on late flight from Newcastle, leaving on early flight to Stavanger, resulted in narrow search window. The grid ref given is in Heathrows Met station area, given the number of signs displayed this is the sort of fence you do not climb. Using the head torch to illuminate the dark corners it was clear that any cannon was well hidden. This did not seem right, earlier posters did not report great problems. Not wishing to admit defeat, closer examination of 1:25000 map shows cannon to north of road, sure enough there it was. Just goes to show how easy it is to be misled by modern technology.

cannon at night

11th May 2012  18:58  by SlainteJimmy

Gridref: TQ 07706 76804   FB Number: Not logged  Condition: Good  Score: 7/10

Definitely North of the OS GridRef, but pleasantly "gardened" and formally plaqued. Visited during a Convention at the neighbouring Rennaissance Hotel. Fitting that one of the first Trigs has turned out to be Ben's last... he went Walkabout at the Con - Fair travels my lil Bear-Friend. :-)

Hounslow Heath Baseline NW ..Ben\'s last bag.

4th May 2012  07:12  by THE CYCLIST

FB Number: Not logged  Condition: Good  Score: 5/10

Having booked my accomodation for the weekend and bought the maps, I remembered reading a log for this. Not a scenic country cycling route, but worth travelling this way to view. Followed signed cycle route in from West alongside A4. No problem finding with map from Website and of course no stopping problems on a bike!

2nd May 2012  13:05  by asbown

FB Number: Not logged  Condition: Good  Score: 5/10

once I had worked out how to get from the tube to the outside world this was a easy find.

5th Apr 2012  17:50  by pog

Gridref: TQ 07714 76789   FB Number: Not logged  Condition: Good  Score: 6/10

Cannon in good condition.

12th Jan 2012  14:37  by Phil Clayton

FB Number: Not logged  Condition: Good  Score: 8/10

Last of four on west London bus pass and walking tour. No. 285 from Hampton Hill and the other cannon in Roy Close.

6th Jan 2012  21:15  by robinhood

FB Number: Not logged  Condition: Good  Score: 10/10

As part of dropping my son off at Heathrow, I took an evening walk from the hotel to this important historical site for mappites. 1 to 250000 map has it spot on though there is nowhere to park for a lengthy stay; at night there's far less traffic so there would be less of a problem. It's hard to imagine what the whole area looked like in the 1780's when the baseline was set up; now planes constantly take off and land and it's surrounded by tarmac and concrete. I'm glad the effort has been made to commemorate the triangulation. Tomorrow the other end!

26th Sep 2011  17:00  by struggling

FB Number: Not logged  Condition: Good  Score: 10/10

Two days after visiting the east end of the baseline, I bagged the brace with this visit. Again, amazed that such an important historic site is relatively unheralded. Thanks to cmb1953 and Griefmiester was an easy find - finding car parking was more difficult! (Try the Heathrow Visitor Centre, a few hundred metres to the east of Nene Road.)

Baseline West - Cannon Barrel & Plaque
Baseline West - Plaque

15th Sep 2011  18:50  by Trigpoint100

FB Number: Not logged  Condition: Good  Score: 6/10

Happened to see Dal's entry for this when browsing the daily logs a while back; I have used the adjacent car park on a weekly basis for three years without realising it was here. Benefiting from an early-arriving flight (they do happen occasionally) and a nice sunny evening (ditto) went to look at it en route home. Very good condition and felt somewhat reverential in the presence of such an important relic of survey history. Interesting plaque, including the measured lengths of the baseline at various dates. Always amazed how accurate late 18th century surveys actually were!

27th Aug 2011  19:12  by dal

FB Number: Not logged  Condition: Moved  Score: 7/10

Marks the north-western end of General Roy's baseline. I have read that this cannon was moved in 1944 and later returned. The cannon at the other end (in Roy Grove) seems to be in the original position. The cannons date from 1791, replacing the original wooden stakes of 1784.

6th Aug 2011  16:30  by cmb1953

FB Number: Not logged  Condition: Good  Score: 8/10

Visited on 4th Aug, but no evidence of cannon. All I could see on the site was a compound full of aerials and antenna.Parking not too much of a problem at this time of night. P.S. After seeing griefmiesters photos, I think I was looking in the wrong place!! All I had to go on was the arrow on the map we access. Revisited on 6th and found it straight away on N side of perimeter road on the W side of junction with Nene Road. Apparently this gun barrel was at the Ordnance Survey Headquarters at Chessington for some time.

3rd Apr 2010  10:10  by descarte1

FB Number: NO FB  Condition: Good  Score: 7/10

North-western end of the Hampstead Heath baseline by Roy (and later Mudge). Was at an event at the Radisson Edwardian over the road and escaped one day to walk from Heathrow to the other end of the baseline then onto Mortlake picking up Teddington Active Station, Ham and Richmond Hill on the way. Cannon is marked on the 1:25k map.

10th Mar 2010  08:09  by Griefmiester

FB Number: Not logged  Condition: Good  Score: 7/10

Visited in March 2010 but was unable to get listed - i think it might of been moved at some stage - located right next to Airport Northern Road just as you enter Airport from M4 spur on the right as you drive in.