I am based in the UK and I was contacted yesterday by a job recruiter. We had a pleasant chat where she explained what the role was. We discussed everything including salary requirements, but when she sent an email later, there was a request (among other sensible things, like how much notice I need to give and how many days of holiday I have taken already) for "exact base salary or rate of pay (which can be evidenced via contract or payslip if requested)". I know that there is no legal requirement for me to share my base rate of pay and I want to decline.
Would it be best to ignore it? If not, what would be a polite way to decline?