Good places for free wifi in London please?

[Southwest]

that's it really, will be central in museums a bit maybe the Hyde Park Olympics place, and Brentford
Thanks

Check if your home Internet provider has hotspots or solar. Like I'm with BT and they have many access points out and about. I just need my password.

Weekipper's suggestion is fab. Probably the best for access everywhere. O2 also has free wifi with their newer package and some Vodafone too.

Install a wifi finder app.

Some places I know have wifi: McDonalds, Patiserrie Valerie, Starbucks (need their card and at least £5 of credit I think to start).