Incidentally, I thnk Glasto shares with some other rock festivals the "traditions" of (a) burning one's tents on the last night - if so be sure to leave fire gaps and have bucket of sand and another of water just in case (I am told that gaz canisters were making the last night at Download sound like the battle of the Somme) and (b) - leaving tents behind.

So if you take a large van to go there in and a wheelbarrow in it you may be able to harvest hundreds or more quidsworth of perfectly ebayable tents on the last day.

Cover the cost of the festival!

Or organise a "mudgather" of the harvestable tents and sell them to donate the net proceeds to the Mudcat...