I'm only linking from eBay Aus, but Nebulaluben used this wig
and I was planning on using it too, but decided to buy an Arda wig instead. Check the link I gave you before, it shows what she did to her wig. She basically only had to trim the sides to be even, and then decided to darken the hair a little.
Edit: Search for that wig on UK eBay, you may find one that's cheaper. There's a half dozen shops coming up for me that sell it.