Sister Ray is located in the SOHO district in London and has an expanse selection of records. They have a ton of punk/HxC and Metal, all separated accordingly.
The prices were a little on the high side, but with the selection, you are bound to find something.
I ended up with a repress of Rage Against The Machine: Self Titled record. Its on clear vinyl with some black streaks. I am a big fan of this record and I think this vinyl is unique enough!
I also found a copy of Down: Nola. I actually came across a few used copied of this in London.