Unmatched Battle of Legends and Robin Hood vs. Bigfoot have been sold out for a while and all games and expansions of the Unmatched series are in general hard to get in the UK. This should get better in the future: like with Downforce Restoration Games will share the distribution rights for Unmatched with Iello. Restoration Games will supply the US and Iello Europe.
The start is making the Battle of Legends core set and the standalone expansion Robin Hoods vs Bigfoot. Both are now back in stock and ready for a fight!
Further expansions are planned for a release from Iello, but no dates have been confirmed yet and probably depend on the licence rights for expansions like the Jurassic Park and Buffy ones.