Urs4 clutch replacement

[albinoDUB]

Morning guys,
I'm looking at diving into urs4 ownership, but the car in question has a slightly slipping clutch.
I've had a scout online and they seem to be hard to come by here in the UK.
Where would you recommend buying from, or taking the car to, as I don't want to really do that myself.
The car will eventually be modified lightly, 350/400 so will be looking for an upgraded item too, to save doing it again in the future.
Any pointers would be greatly appreciated