I was at a sizzling pub on Saturday, and i noticed the chap in front of me produce a green card and receive 20% off his food bill, so looked it up and found that you can get an app, on the phone, participating pubs will give 20% off, also some great offers such as a free starter, etc. I got my meal, with a free starter, and 20% off on Saturday. No idea if this has been on before but thought i would bring to the attention of the HUKD
Its generally active 90 miniutes before and after sporting events (Football/Rugby/Darts)
It depends if your local does the Monday Club (some do the Tuesday club as well)