A couple of points, with due respect, in regard to some of the proposed questions.
While I'm not sure that asking prospective employees for their permission to conduct a credit check is a bad idea, I'm not convinced that it's a particularly good idea either. It's fairly settled that financial institutions will conduct this search as a matter of course, since prospective employees are either cash handlers or in a position where an abuse of trust could be catastrophic.
I struggle to find the relevance in the cleaning industry. My personal view, and it's entirely my opinion, is that this would be an unnecessary and invasive procedure which would have the high potential to embarrass a new team member who's struggled to pay debts in the past. CRB and address checks are an unfortunate necessity but I think that's as far as I'm prepared to go.
When asking medical questions, you should also be aware that if a condition is disclosed which is capable of protection under the Disability Discrimination Act and you decide not to employ that person, you should be prepared to offer robust reasons why you have made that decision and none of them should be related to the disability if that disability can not be viewed as being capable of reasonable adjustment to carry out the work required.