I see. In the end I just got this membership, I don't belong to any of those.
You have to work for the public sector, so NHS/Civil Service/Local Authority/Armed forces.
Thanks, just done this myself - £4.25 a month and it gets you and another adult guest (plus up to 6 children under 18) into English Heritage properties for free. A digital card was sent within about 15 minutes of signing up too, so going to try it out today (it does say on the website it could take up to 48 hours though). Thank you for the heads up! Terms are on this page here (scroll down to English Heritage).
You are a beautiful person, just bought this, a bargain.
What's the catch? That membership looks significantly better, I don't know how it can be so cheap?