Yes, it does mean 2:1 but that might not be the overriding requirement, especially if you have obvious motivation and relevant professional experience. You've nothing to lose by contacting them, as RBotP suggests.
This might be fine- they are looking for academic ability to complete the course (which an old value 2:2 might be ok) and for enthusiasm and interest in the subject (which you have in spades). I would definitely email the course co-ordinator/contact person briefly outlining your experience and qualifications and ask them if you should make an official application. My feeling is they will (I would take you on a Masters).
I have a 2:2 and ended up doing a Doctorate at Oxbridge, via a funded Masters. I was the right person at the right time and had good referees. One of my colleagues at Oxbridge had a degree from a Poly (and she was much more academic than me). I think your DH is a problem, and may have his own chips on his shoulder. I would talk to Roehampton they have always been lovely when I’ve talked to them. And you should have a lot to bring to such a Masters.