Sorry should have said I'll be driving from Basingstoke. I'm not too sure if that makes any difference with the driving miles. I'll need to check that one out.
Tried it once - didn't like it (as the man with only one child once said)
The road in to the slipway always has cars parked on both sides and it is very trickey to drive through. You'll be lucky if you can get somewhere to park and leave the trailer attached.