out of the uk tracks i have ridden,(fort bill, pitfichie, ae forest, inners, dunkeld, scolty, and some place near durham) i would have to say.
fort william for its ultimate awesomeness and legendary stories from mere mortals
pitfichie because i helped build it, because it was the first track i raced and the fact it is natural.
dunkeld for the top section - for those who have not ridden it, its insanely steep and rocky - and the fact it eats shoulders for breakfast.
ae for the jumps, simple as that
inners for the variety and versatility,
and scolty because i started riding the trails 4 years ago, helped build most of the trails, it has taught me my skills, and the fact it is a 5 minute cycle to the bottom of the trails.
so really there is no ONE good track, their all good