I've had a Defence Discount Card for a few years, and put it to good use. However, as I know there are a few other ex services on the site, I discovered a few weeks ago that we can get a Blue Light Card. £4.99 for two years. It seems to cover all the same places that the Defence Card does, with the added bonus of 10% off in ASDA, simply on production of the card, (and proof of identity). In this day and age 10% is worth the £4.99. Had mine for 3 weeks, well worth it.
Not sure how long the 10% will go on for.
I just had to upload, the discharge page from my red book. 'Every Little Helps', no, wait that's Tesco