Just a note to say that any road pricing per journey will only take place in england, if it is introduced by the British parlaiment in Westminter. The Scottish and Welsh parliaments have control over transport policy for their nations, not Westminster, and have stated that there are no plans to introduce such schemes. Therefore, you should only be affected if you travel to festivals in england. More info can be found here:

http://www.thecep.org.uk/news/ViewItem.asp?Entry=1494