None are mine.
Sherpa. "21 inch" from BB to top of seat tube by seller's measurements. Older, 105 double/8-sp, butterfly 'bars, Ideale saddle, dynohub with Hella lighting, Tubus rear rack. Sold on behalf of friend; highly personalized.
http://www.ebay.co.uk/itm/Thorn-Sherpa-touring-and-expedition-complete-bike-21-frame-/220985867894?pt=UK_Bikes_GL&hash=item3373c8be76Club Tour "21 inch" with panniers, touring spares. Used on a number of tours, dent in frame.
http://www.ebay.co.uk/itm/Thorn-Club-Tour-21-frame-24-speed-touring-bicycle-/120884539329?pt=UK_Bikes_GL&hash=item1c2547afc1Audax. Seller claims 24-sp and "21 inches short top tube". Looks pretty in pics; red/blue.
http://www.ebay.co.uk/itm/bicycles-/251026740003?pt=UK_Bikes_GL&hash=item3a725c1323Thorn derailleur kidback tandem for adult and child.
http://www.ebay.co.uk/itm/Thorn-tandem-adult-and-child-/200733802048?pt=UK_Bikes_GL&hash=item2ebcaabe40Thorn derailleur kidback tandem for adult and child. Appears to be a relisting.
http://www.ebay.co.uk/itm/Thorn-Explorer-child-back-tandem-/180850514552?pt=UK_Bikes_GL&hash=item2a1b87da78Thorn Explorer derailleur tandem. Largely LX, 27-sp, racks and kit.
http://www.ebay.co.uk/itm/Thorn-Tandem-Bike-/220985768596?pt=UK_Bikes_GL&hash=item3373c73a94Best,
Dan.