In the Uk- possibly only london. There is a company that you can
register with who once a month or so, send out little coloured
vouchers for "two for the price of one" top price theatre tickets.
They send out the vouchers for you to leave in your work reception
area so people to pick up. They always seem to be doing offers on
seeing the reduced shakespeare company

Hello.

I believe that the London-based company that you're looking for is "Show Pairs."
Visit their web page for more information:
http://www.show-pairs.co.uk/

search strategy: "2 for 1 vouchers", london

I hope this helps.

fantastic- i could not find it anywhere