Eventually found someone to come out and do it for a bit less (£300) than what RR charge when you go to them (£340). http://www.automotive-locksmiths.co.uk/

Looking for a service to come to my place (E9) and supply and setup a spare key for a 2011 RR Sport. Lost the other spare some time ago and it never turned up. I know I can go to a dealer but am short on time in the next month or so! Any advice re suppliers would be appreciated.