Kate Bush used to be a Naim/Linn Sara owner (with an LP12 no doubt).
Douglas Adams was a bit of an audiophool, graduating from Isobariks to examples from the Absolute Sounds' (UK importer) portfolio.
Pink Floyd used ATC's at home at one time (an interview with Richard Wright before he passed on showed an SCM50 in the far background).
Tina Turner had ATC 50A's
Dave Formula (Visage) had a Linn/Naim Sara system once as I recall
I also believe George Harrison had a B&O system in his London flat and Tim Henman and Barry Humphries are other B&O owners
Richard Carpenter, who wrote Catweazle, Robin of Sherwood and half of the Black Beauty TV series' owns my ATC preamp, 100A's (now SL's) and an LP12/Ittok/Troika I once sold him (oh, and a Levinson CD player as I recall)
I also remember Jon Moss (Culture Club) was a Studio 99 client. Oh, and Dave Greenslade and Bob Monkhouse bought loads of audio r-r (DG) and video (BM) tapes from us.
I remember selling a Walkman to Martin Shaw in the late 70's and not recognising him without his perm.....
Finally, I had a lovely client who bought a Linn/Meridian and Harbeth system from me in the late 70's. When I came to prepare the invoice, it turned out to be Lord Howard - address, Castle Howard....
Oh yeah, Frank Ifield had a Quad/Tannoy (Chatsworth as I remember) system in the eighties which his son inherited when Dad emigrated back to Australia. The amp was fugged as I remember and needed a full upgrade which wasn't then available easily. The Tannoys had corroded pole pieces according to Lockwoods but still fetched £500 I think (20 years ago), going to the far east as many did and do.
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me