Short notice but...
My mate Rich & I are heading to the Surrey hills for a dusk/night blast on the MTBs this evening; all are welcome to join us. Meeting at the Peaslake bus shelter at 6pm for 1.5 hr-ish ride.
Rich is bringing his portable pressure washer, so you won't have to put a muddy bike back in your car (you might have fill the washer up from your Camelbak though...).