I recommend OrchardHosting.com, they are UK based with servers in London. I've been using them for 2 years now for my personal email and website and only ever needed to submit a support ticket when I changed my contact details. Never needed any other support. (their main website is ran off a donhost server, but they have 4 of their own servers at a London datacentre).
Hi there, I guess if you are looking for RELIABLE and don't mind that the hosting centre is physically located in the US have a look at
4 years of perfect service and near zero downtime. They are a bit more costly and I would hope that they upgrade diskspace at some time. But you get 1a service and reliability for a decent price.