Big shout of thanks to Hogshunters for getting us all the emails that TPTB didn't - just found the necessary, and it was our first chirp, so happy bunnies 
Not fussed about souvenirs, or chirps for that matter, but they are a bit of fun and I liked the way you had to do easy puzzles to get the answers - although there are plenty of places to get the answers on 'tinterweb for those that are too lazy to do it - sounds like lab caches to me 
And I met our old friends the Stag Ramblers as I was making my way back to the car and the sun came out