Vouchercodes.co.uk is no great secret and supplies money off or 2-for-1 vouchers for a wide variety of restaurant chains (Ask, Pizza Express, Chiquitos, La Tasca, etc).
If you don’t have access to a printer during your visit then there is an internet cafe not far from the mile and for the price of 1 sheet of A4 you could save lots of money on your meal.
