You can save yourself a few quid by going through Carphone warehouse. They currently have it listed up for £295 SIM free and with free delivery. Given my experience with the Play store last time round I think I’d go with these guys (your mileage may vary!).
Looking for a SIM to go with it? I currently recommend GiffGaff.
If you are buying a Nexus 5, please let us know all about your decision in the forum.
Many thanks to this tweet for the heads up:
Wow! Something crazy is going on when Carphone Warehouse is selling the #Nexus5 for ~£15 cheaper (inc. delivery) than Google direct…
— James 「ジャム」 Gregory (@jamgregory) November 1, 2013