I lived in the Hounslow area for 40 years. I'd give the Hounslow Sikh Temple a call or (probably better) email them. Several members of the Sikh community in the area own properties for let. Wonderful people as well. The Hindu temples and the Mosques are worth a try as well though I don't know those communities as well as I know the Sikhs.

St Mary's College in Twickenham is somewhere you might consider placing an advert. Probably best if you go down and put up a notice or see if you can post one on a website that will be read by faculty members or mature students looking for people to share. Other colleges aren't a bad bet either.

There are several moorings for houseboats in the area on both the Thames and on the Grand Union Canal. There's a site called something like apolloduck.co.uk that advertises sales and lets for houseboats. Might be a cheaper alternative. There are moorings at Isleworth, Kew Bridge, Brentford and Hanwell.

Whitton, Feltham, Brentford, Hanwell, Southall, Cranford and Heston are all areas that with a bit of luck are still fairly affordable. Parts of Isleworth aren't too bad. Osterley, Chiswick, Twickenham, Kingston and Ealing are all within reach but are likely to be more expensive. Richmond is an arm and a leg and isn't nearly as nice a place to live as it thinks it is.

By the way, there's apparently a decent Irish session nowadays at the Prince Albert on the Hounslow Road in Whitton.

Good luck!