The Eurail Pass is not valid in Great Britain, but if you're between the ages of 16 and 25, ACP Rail and BritRail have a deal for you: Purchase any Eurail Pass and get a 50 percent discount off the regular adult price of a standard class BritRail Consecutive Pass, BritRail FlexiPass, BritRail England Consecutive Pass, or BritRail England FlexiPass.
The offer is valid throughout 2008. Phone 1866 938 RAIL and order your Eurail Youth and your BritRail Pass. If you already have your Eurail Pass, log onto BritRail.com and choose the Eurail Pass Tab on select BritRail passes. The Eurail and BritRail Passes must both be in your possession at the time you travel in Britain and they must both be valid for travel.
BritRail Passes are available for as few as 4 days and up to a month and can be used on 19,000 daily train departures to more than 2,500 destinations.
With the tumbling dollar this could be just the ticket.