RE: Question on Gyms
I live in Hounslow, quite close to Heathrow. There are a few gyms around here. Sounds like you've been to Topnotch and Feltham Community gym, but there are a couple of others:
1. Olympia fitness in Hayes - proper bodybuilding gym
2. David LLoyds in Heston - im a member here, has excellent free weights but pricey
Let me know if you need to know anything else!