I'm currently watching The Hide (on Film 4) and it's by far one of the best psychological dramas I've seen in a long time. It's premise summed up reminds me of a cross between The Deliverance meets The Odd Couple think Travis Bickle from Taxi Driver stuck in a shack with Roy Cropper (from Coronation Street) discussing everything from garden gnomes and power tools to inappropriate jokes.
No A-listers (even on a British cinema scale), no special effects and one location throughout, it's worth a look for anyone who likes their drama slow winding and gritty.