I think all the posters saying ‘I have nothing to hide’ are very naive, missing the point and incapable of seeing how this will be misused.
No-one should be allowed to access your accounts without the bank notifying you. I’ve worked my whole life, never committed a crime and I value my rights.
It won’t be used to prove a parent isn’t paying maintenance when they should be. That’s money which belongs to the other parent and not the government - so it won’t be a priority.
It’ll be used to try and find excuses not to pay poor people benefits. eg, when my ex DH and I separated we sold our house and split the profits. I claimed universal credit for our two young children. There’s a UC clause that says when you sell your house, you have six months to buy another property with the proceeds, without your benefits being affected. Because I’m an honest person, I told UC that I had £20k in my account from my house sale and I’d notify them asap once I’d bought a new house (we were staying in temporarily emergency accommodation because my ex was abusive).
UC stopped my benefits, didn’t reply to any of my contact with them through the online site, and put me in a very difficult financial position. I needed every penny of that £20k for a mortgage deposit and was eating into it for five months because they’d stopped my benefits. I made a complaint which they ignored, I had to involve my MP and only then did they reinstate my benefits (backdated) without a word of apology to me. I’ll never volunteer that information if I move home again. They can’t be trusted to do the right thing and don’t care if they put honest, hard working people into financial difficulty.