Well, I've got the use of Kidlington band's Holton TR181 Bass Trom and a Sovereign Euphonium. I also own (in pitch order):
P. DeLacy Bb Cornet - pretty but leaky.
B&S Eb Alto Trom - blows gorgeously.
Bach 50B2L Bb/F/D Bass Trom - well and truly knackered.
B&H G Bass Trom - not a great specimen.
Miraphone BBb/FF Contrabass Trom - rather hard work.
Not to mention an upright Piano, by the iconic Povey and Wade of Newbury. And a recorder and a tin whistle.
Oddly, I've never got around to buying a Tenor Trom - I tend to borrow one when it's needed.
JessopSmythe was asking about finding Contras; eBay is a good place to start - I posted the link to the sale where I bought mine recently in the 'Bass Trombone' thread. The seller there is a good contact in the Contrabass Trombone world He's called Ed Solomon, and is the British Trombone Society webmaster; their site is at
http://www.trombone-society.org.uk/content.htm, and has an article on the Contra and some info on Mr Solomon together with pictures of his excellent collection of Trombones amongst various other assorted goodies.
There's also a general contrabass (i.e. not just Trombones) mailing list that you can join at [/url]www.contrabass.com on which someone will post details of any such instruments for sale that they spot.
Dave