Main Motorcycle: '04 Sprint RS
Join Date: Jul 2007
Location: Austin, TX
Other Motorcycle: 2000 Sprint ST
Extra Motorcycle: 1996 Ford F-150
Reg issues are solved easily enough for ~£100, and not in any way exclusive to Sprints or Triumphs. The only concern I would have about a bike with 22k on it is the service you mention.
Do yourself a favor, though: when you're looking, let the bike idle until it's up to temp, then rev it to 4-5k while watching the tail pipe. Some people on this site swear there are some out there that don't burn any oil, but I've never seen one myself.