Hello Nigel,
I've owned it coming up for 7 years. Bought it as a "restored bike" but after stripping it down to check it over ended up re-restoring it !! luckily bought it at the right price at the tiume so the sum of the parts was equal to the value I paid otherwise I would heve been upset.
The prewar twins are great to ride, have just as much power as the post war ones, and quite good brakes too. In a road test Classic Bike carried out a few years ago they compared all the various version of the 5T Speed Twin at the same time, the lower weight of the earlier twins means they have a greater power to weight ratio than the later 5T's and 5TA's built. The Tiger 100 is even different to ride than the 5T because the fork rake angle is sharper and the larger tank means a slightly different riding position.
Not sure I'd stretch to £12K-14K though now, but it appears these are the prices being asked for by the dealers out there, they are even advertising early 60's unit Bonnevilles for £8-10 K now I've seen. I only hope the prices stabilise and these dealers take a reality check sometime (when they have showrooms full of unshifted stock).
Keep up the good work with the site Nigel.
Martin
PS Did you go to the Bristol Show this year ?