Mortgage consent form help

[EverybodyKnowsThatYoureInsane]

Good morning. I'm not sure if this is the right place to post. I'm getting so frustrated. I hope I can at least clear some things up. My husband is the owner of our house and I'm not on the deeds. He is in the process of switching mortgage to save a considerable amount of money each month. The bank that provide the mortgage want me to sign a consent form to basically say I am not on the deeds. It's a very short form with five clauses, one of which is "have you read the other 4 clauses. I'm all fine with the document my issue is it has to be witnessed by " a solicitor or a fellow of the institute employed by a solicitor". I don't have or know a solicitor. I phoned a local one and I said it would cost £500 plus VAT! That just seems like a lot to me.
My question is

1. is this actually a reasonable amount to pay for this kind of service.
2. am I looking in the right place? Or is it a specific type of lawyer that I need?
3. is this something that citizens advice would help with? Dh is badgering me to go and see them but they are only open for very limited hours, all of which when I have other commitments. From what I can see online, they wouldn't really be able to help me other than maybe point me in the direction of local solicitors. ( For example, I don't really want to have to use a holiday day from work and then still have to spend 500)

I hope that all makes sense. Don't ask why I'm not on the deeds, we are hopefully moving soon. And I will certainly be on the next one.

It is surprising that they require a solicitor to do this. I am the sole owner of our home and my husband has signed these before, but he has not been required to get his signature witnessed by a solicitor.

I understand why a solicitor will charge £500 if the signature is going to get treated as them having advised you about it. The liability is high if they later on get treated as not advising you properly and the mortgage lender can't sell the property to realise its security. Even though the advice is simple i.e. if your husband doesn't keep up repayments, you will both lose your home.

Your husband should be paying for this though.

Oh absolutely he will be paying haha
We did the same a few years back, I can't remember if it was witnessed at all definitely not by a solicitor.
Oh well I suppose he will technically make the money back saving on the mortgage