Reducing my hours to part time working

I currently have a salaried income and am in receipt of an occupational pension. My income has a tax code of BR and pension as K375. I am applying to reduce my hours from 37 to 30 hours per week and this will reduce my annual income (salary only) by about £7000. I am hoping to make this change in April 2025. Will my monthly income tax deductions begin straight away or will there be a delay during which time I will continue to have income tax deducted at the rates applied now? Should I amend pay figures on my tax account page manually at the time or do I need to call Inland Revenue to make an adjustment? Is the change from full time to part time likely to be seamless? Thanks

Hi,
Unfortunately, it is not possible to check individual tax records through this forum, if you have a question which relates to your personal tax situation or tax code please contact our Income Tax team:  
Income Tax: general enquiries
On this page you will also see a link to personal tax account which may be the quickest way to review information relating to pay and tax history, tax codes and how to change them.
Thank you.