I was told something by a knowledgable local about Beckhampton Long Barrow, but can't remember if it was that it is the oldest or the biggest. The statistical likelyhood is that the biggest is in Wiltshire as it contains 148 of the 240 known examples (apparently).

I wouldn't mind knowing a useless fact like this. West Kennett is 85m long I think.

An antiquarian documented that The Bridestones in Cheshire* were 120 years in length.

Of course we all know the formula for correcting antiquarian exaggeration.

Cheers

Grendel

* this monumnet is sumptuously covered in "Prehistoric Cheshire" a book by etc etc