Pete has commented before that if both these constituencies existed today Brentford & Chiswick would now be much more Tory than Brentford & Isleworth as a whole (the reverse of 1970) and Heston & Isleworth would now be a safe Labour seat.

Mitcham & Morden (Lab)

Would have been Labour in 1970. I can see why you might have through it would have been Tory (the Mitcham seat being won by over 5000 by the Conservatives) but that included Wallington and excluded Morden. Radio Times 74 list M & M as a Labour seat.

Dulwich & West Norwood (Con)

Likely to have been Tory in 1970 because Dulwich was Labour by 895 and Norwood by 613. The combined seat excludes some of the more Labour areas further North form both seats.

Brentford & Chiswick (Too close to call)

Had a Labour majority of 513 in 1970. The Radio Times pages for the Feb 1974 election listed Brentford & Isleworth as Conservative but the addition of Hounslow West may have tipped the seat in Labour balance.

Ealing North (Lab)

Might have been won by Labour in 1970 as it had a Labour majority in 1970. Boundary changes in 1974 helped the Tories, 1983 helped Labour through the removal of a safe Tory Ealing Ward, 1997 reverted more or less to the 1974 boundaries and 2010 reverted more or less back to the 1983 boundaries so I think Labour would have won the current Ealing North in 1970.

Putney (Too close to call)

Wandsworth Putney had a Labour majority of 1300 but included what was then a very safe Labour ward that is now a Tory ward in Battersea. Its possible the removal of that ward in 1974 (and the constituency has only had very minor changes since) would be significant but more likely a Labour majority of a couple of hundred.

Westminster North (Con but only just)

I agree that the Conservatives would have won Westminster North but Labour were ahead in the sum of the Paddington seats by around 500 votes and the Northern part of St Marylebone is not really that Tory. St Johns Wood is largely balance by Church Street.

In 1979 the Tories won Paddington but the notional for Westminster North was only just over 2000, so that would equate to 1500 Con maj in 1970.

Romford (Con)

Romford is interesting because Labour won Romford by over 2000 in 1970. I think Pete has allured to Upminster being formed from the more Tory parts of Hornchurch and the more Labour parts of Romford (hence the Conservative victory in Romford against the trend in 1974).

I think the proposals for Ealing Council area are some of the worst in London.

Perivale has strong links with Greenford and Northolt. Although i know Perivale and Alperton are now very similar it shuold still be with Greenford and Northolt.

At a guess:

Con gain from Lab
Harrow W
Brent N
Ealing N
Westminster N
Ilford S
Streatham
Croydon N
Mitcham
Lewisham W

Con gain from LibD
Twickenham
Kingston
Sutton
Carshalton
Hornsey

Lab gain from Con
Putney
Battersea

Lab gain from LibD
Bermondsey