This deal's been around before, but they’ve just started it up again. Catch an "Arriva" bus, and on the back of the ticket is a voucher to get a Big Mac, McChicken Sandwich or Filet-o-Fish & Medium Fries for £1.99. Expires 16/12/12; one per person per day. I don't know if it’s all areas, but definitely Surrey.
Unlike a lot of these vouchers, it’s not fixed to a particular restaurant, and even works at the ones in stations (not drive thru though).
Now here's the cheap bit: depending on how your ticket comes out, you may get 3, but at least 2 of the vouchers, so cut your ticket up and re-use them.
And here's the seriously scabby bit: hang around a bus station and pick up discarded tickets!
Or download your vouchers from today's e-Metro page 42. http://e-edition.metro.co.uk/2012/11/15/
Also on the back of Stagecoach and Thamesdown bus tickets in Swindon