A very serious note!
I`ve just been into Sale, Manchester, and there were lots of roads with signs saying that the road would be closed most of Sunday because of the Manchester Marathon. When I got back I looked up the Marathon route , and I hate to say it, but the start and the finish are probably a little less than a mile from P3. I should imagine it will be chaos in the area on Sunday.
It also looks as though some of the most obvious routes to P3 will be closed.
I`m surprised that the P3 people haven`t mentioned it.