as daft as it sounds i have a pair of sealskinz and on one trail run i knew i was going to be knee deep in water and the thought of water inside the sock was not so appealing. I put a strip of insulation tape around the top of the sock sticking it to my leg (not too sticky that it rips the hairs off when you remove it), and it worked perfectly, the water ran straight over the tape, outside the sock and feet remained bone dry. Do that everytime now and works perfect.
Richard I always park at South Sheilds and get the bus to the start but give yourself plenty of time if you choose this option as you don't want to miss the baggage busses etc. loads of banter on the busselobules the excitement.
What sort of time do you have to get there for before the car park starts to fill up?