I sent a letter and SAE with US stamp to the Stage Manager on: 27th February 2014, and today I recieved this pack back from the show, with information about the show, along with a programme which is signed by the cast, stage manager, director etc.
as my SAE was too small, they used their own, and sent my SAE back too.

Really happy with this success.
address I used was:
Stage Manager of ' Back To Methuselah',
Undercroft Theatre,
900, Massachusetts Avenue,
NW Washington
DC 20001
USA
ADDRESS NO LONGER VALID!!
Here are the pics:
