Try here . This is a reputable dealer in Nottingham, not too far from you. One thing to remember; the bow makes a huge difference to both playability and tone, and good players tend to pay almost as much for the bow as they do for the cello. Don't discount instruments made in China or Eastern Europe. There is a fine tradition of good instruments from Eastern Europe, and the Chinese have some of the best tonewoods in the world, with some really good 'boutique' luthiers now starting to emerge.
Tim (whose father took up the cello as his first-ever instrument at the age of 70, and now plays in a small chamber orchestra at the age of 83.)