My friend uses
DVD Options
He says "I'm pretty satisfied with it, except that they are not very
up to date. But you get the movies for 3.50 for seven nights, plus an SAE to send them back in.
Just lately, though, I've been using Blockbuster's similar service -
http://www.blockbuster.co.uk then go to Rental by Post. It's a similar
system, except you only have five nights, and it's more expensive at 4.50,
but it's bang up to date. If it's in Blockbuster's store, it's available
for rent."
Hope that helps