Boards
Free(ish) cinema in London
http://www.roxybarandscreen.com/listings.php
Borough High Street/London Bridge area.
There's a French film festival on at the moment and I think they're showing a lot of stuff from that.
My friend's friend went on a date there today and paid £3 for two films.
Food is meant to be good too.
If you go, be sure to check out the blue men hanging from the building next door!
:)