I'm not familiar with Swinley Forest, but it's going to rain Sat & Sunday.
Gorrick's race kicks off at 08:30 Sunday so after a while it's going to witness many hundred pairs of wheels and tyres.
Can you tell me what the ground is likely to be like?
Change out the RRalfs back to winter tyres?
Bring my canoe or not to be at all concerned as it's very well drained?
Thanks

