No you can't change the currency. We list to eBay.com only right now. eBay doesn't make it that easy for us. eBay.uk is an entirely different site. It takes a lot of work to support a 2nd eBay site. Not as much as coding for the first site but still a lot of extra work.
There are several threads in this forum detailing that and our plans to add support for eBay.uk.