Basically, there is a form on the Inland revenue site, you need to fill it in and send them back, but if you are only out here temporarily, then you may still have to pay tax. There are rules, like you are not allowed to be back in the uk for more than 90 days a year, so for last year you would have been in the uk for more than 90 days and so you still have to pay tax.

I could see if i can find the form and PM it to you?