Yes, I bought my BLS from Riders Group of Exeter where the car had its PDI and I have had it serviced at Manchester (1st service) and Milton Keynes twice.
I hope that Milton Keynes continue to provide support for the Caddy well into the future, they are a great bunch there who were extremely complimentary about my own car the last time I took it there.
As for Riders at Exeter, well despite me living 230 miles away from them, it isn't actually a problem for me going there for support if I need it. I know the area well because that is where I originally hail from, so I can just fit it in with a visit around my family if needed.
Manchester is by far the closest to me at 60 miles, but it is a right PITA to get there, that is why I go to Milton Keynes 'cause it's a straight journey there and despite being 30 miles further, it is quicker and I use less fuel because it is all motorway.