The UK’s 175th Anniversary of the Penny Black is not open for online orders. Check out the items at: http://shop.royalmail.com/issue-by-issue/175th-anniversary-of-the-penny-black/icat/175thanniversaryofthepenn
There is also a London 2015 Europhilex Stamp Exhibition overprint version: http://www.london2015.net/royal-mail-collectibles-revealed/
If you are keen to own a UK’s version, just remember that their FDCs are printed with your name and address. Thus I will not be taking pooled orders for the UK edition. It is also too expensive.