FLGS vs OLGS
Here are some of the stores I have personally used:
Orcs Nest, London:
If you are in central London, then there is only one real choice. Orcs Nest is situated just off Charing Cross Road near Leicester Square underground station. It's quite a small store, but has lots of cool stuff packed in. Prices are MSRP, but I can forgive that due to their location.
Leisure Games, London:
Spirit Games, Derbyshire:
Shire Games, Stoke:
If you're in Stoke, Shire Games is the place to visit. You have to pay for parking (unless there's a trick I'm not aware of), but it's a lovely store, open plan and very well lit. Prices are slightly below MSRP also with bulk order discounts in place. It's worth noting that they have free shipping if the order is over £50 too.
P.S. Bonus points if you can name the film the title is taken from