Southend is quite good if a little expensive. Its main advantage is that you can just turn up and clear customs. If you're going abroad they will sell you cheaper fuel and help with the drawback and flightplan so the higher landing fee is reasonable value.
I have also had to wait ages for their Avgas tanker so call for fuel when you are taxiing in. Last time I was there trying to do a 30 min turnaround on my way to Guernsey I had to wait almost 2 hrs for fuel and so missed lunch in Guernsey. They were very apologetic but I didn't get any reduction in landing fee.