Height Nook is lovely! I've been there as a brownie, guide and a leader and its fab
The Unite challenge was made to support local charities but it came out a while ago so I'm not sure if badges are still being sold. There is also a Japan challenge badge to fundraise for a leader going to the jamboree in 2015, I'll see if I can find her post on here and add a link!
Unite badge: http://www.girlguidinglancsborder.org.uk/unite.html