I just got one of these cases and they are really nice - pcworld has them reduced to £24.99 from 79.99 (they are available from other shops for about 40 quid but there is still a saving there) you can collect them at store too (but make sure you order them from the website first!)
Use Quidco for 5% cashback too...
Antler New York Leather Laptop Case
# For up to 15.4"laptops
# Genuine leather
# Shoulder strap
# Mobile phone holder
# Fully padded