While we were in Swansea we went to Pizza Express for lunch, which was delicious and as big or as small (for us dieters) as you want. I was rather impressed, there is a place in Carmarthen that serves Pepsi when you have asked for a Coke (and they looked at me a bit strangely when I complained) but in Pizza Express I said "Can I have a Coke, please" and she replied "No, sorry, Pepsi?" which I think is more respectful, giving customers what they have ordered