Classic Football Shirts from UK is a very good shop. I've bought 3-4 shirts from them and they are the real deal. If there are any problems with the shirts, they notify before shipping. Like, I bought one from them about a month ago. The description said that the jersey was brand-new but there were some small stains on the printing. Before shipping the shirt, they notified me about the stains, sent me some pictures and shipped only after I confirmed that I still want the shirt. They even gave me a five pound discount.
They have a great collection. They buy a lot of old stock from club shops and sell these. It's a great site to get quality shirts. Highly recommended.
Nashid