So, I sent the "i'm not doing it without it being added to job description and pay regrade" email.
Direct manager politely asked if I had lost my mind, was I sure I meant to come across that strong? - I said yes, needed to be said, happy talk through.
We have a lengthy chat on business direction of travel (downward), funding (downward), upcoming job loses meaning everyone needs to take on more (upward). I point out there is no recognition or reward process (been in design for over 3 years) and there are no promotion or development opportunities in the department - manager again confirms this is the case and will continue to be so.
I get on with the day, and a more senior manager then asks for a chat. They apologise that the work was passed in the way it was, no need for me to do the work - and it will be passed to the admin lead to sort out. I point out the risks, lack of resourcing and the senior manager basically confirmed what I thought, it was only ever going to be a paper exercise, no compliance work will be prioritised.
I'm glad I spoke up, but I'm gutted they aren't taking this work seriously enough to actually pay for it - it's highlighted to me just how frightening it is in my work now.
As there is no chance of progression in the role, clarified again by senior manager, I said I would be looking for career options elsewhere (and I mean it). This really shocked the senior manager, I then got called into another meeting with my direct manager asking if I was sure I wasn't backing myself into a corner (no, actually I feel relieved) and couldn't understand why I would want to go as I work part-time on an ok wage - was it because of feminism? (we spoke alot about principles and fairness, but it was still a bit of a swerve I wasn't expecting!)
Luckily I like him , so I said yes, setting an example for my kids on being pro-active and achieving in work as a mother was important to me ( I've slogged the last 3 years getting my masters, so where he got the impression I wanted to put my feet up I have no clue).
So the result is; 1 startled senior manager, 1 direct manager muttering bugger and doesn't want me to go, 1 director with a headache, an admin lead who I have no doubt will want to kill me come Monday and me needing to work out what the heck I can do outside the public sector.
Thank you to all of you for the advice, I built a proper case for the work but there just isn't the appetite.
In hindsight, I should have kept my powder a bit drier on the progression front, but I wasn't going to get another proper opportunity to say it in an up-front way, and it's all been very matter of fact with no histronics.