The Cinema in London can easily cost £10. Now for £10 you can become a member of the Prince Charles (located next to the very central Leicester Square) and then go to the cinema for £1.50 (before 5pm) or £3.50 evenings. Full price is £5 which is pretty reasonable anyway. Movies range from Block Busters (a few weeks after they make it to main theatres) to more interesting International Movies, Classics, Sing Alongs (people wear costumes and sing at the cinema). Overall: cheap and fun!