I was going to say you were being a bit picky with the 12,000 mile service interval worry, thinking that wasn't "out of sorts" but looking at various websites they all say oil and filter every 3000 miles CLUCKING BELL, that's ridiculous.
In my mind the service book means sweet FA anyway, it could be fully dealer serviced but had the **** ramped out of it from day one.
Or it could be a weekend car that misses the odd service or two.. I know which one I'd rather have!
If It looks alright, goes alright, makes all the right noises and is priced right then it's one to buy, END OF.