Unsure what the laws for it are like in Europe, but I believe that they are a lot more lax than it is here in the US. You should be able to get it unlocked at almost any phone shop for a small fee. I've even heard some people claim that there are little booths in train stations that will do that.
huh, there is no technical agent located in any tesco store in the UK. for technical issues such as email, wifi, vpn, network connections, its best you call your network provider or go online to chat with an agent. Most network sites have the methods to follow to get their locked phone unlocked at a fee.