HI x-kid from another fellow brit i say buy as new as poss with the least amount of miles. Depending on what you want either a bike with all the mods all ready done or standard so you can put your own stamp on it.I believe all ways check through the service history properly tells you a lot about the bike.Also ask them if they have ever been a member of this forum. If they have then don't buy it
No but really i have several bikes and have read scary things about all of them from other owners. But my rocket is a one off and been the best bike i have owned.think the only issue you got at the moment is you don't own a rocket
good luck in your search hope to see pics soon.