The trails are still running sweet on Leith Hill, as long as you choose the right route. The Nirvana Freeride practise ride (Saturday's 10am at shop) has been spending a bit of time over at 'Contraband' which is a long singletrack trail with lots of jumps to hone your skills on. Here's a link to a video of one of the sessions https://vimeo.com/190385767
Here's another clip of Dave on his Cube Fat Bike nailing 'Cellar door' which is also on Leith Hill.
It's also worth noting that 'The Plough' Pub at Coldharbour is under new management & is now mtb friendly so a good place to stop for mid/end of ride food & drink.