Default screen and digitzer- where to buy in the uk?

I just dropped my trusty 2nd gen nexus 7, and the screen smashed, and is not responding to touch.
I've seen videos on the replacement, but where is a good place to source the parts? There are limited reviews on amazon, very mixed about the quality....and ebay seems the same price but without any reviews.
Anyone done this and can recommend where to buy from?