In order to be eligible to vote in the Euro and County Council elections on June 4th you must be registered by no later than 19th May 2009. If you would like a postal vote for these elections the closing date is 5pm on the 19th May 2009.
Here's a registration form, that you have to fill in and return to your Town Hall by Tuesday. If you need a postal vote, there is more information here and for proxy votes, see here. There is a downloadable leaflet (158KB PDF) here which includes a sample ballot paper and a note on the importance of voting to keep extremists out. For information in other languages, go here.