Shrimps,
as I say, Capita are huge and run anything from the Docklands Light railway, Local authority departments of all makes, the London Congestion Charge scheme and a miriad of other things worldwide.
However, don't worry, they are just an outsourcing contractor and a pretty good one at that, if your contact ha email addresses for both them and NATS he can't be doing too bad a job
.
Good luck.