Hi Rush787,
If you had relief for expenses in your tax code and the amount of expenses reduced then this would then mean that there would be an underpayment in the current tax year and your tax code adjusted to collect the underpayment. To check if this was the case you would need to contact HMRC
Income Tax: general enquiries. Once your claim is reviewed if the expenses are due then your tax code will be updated going forward with the expenses as an estimate for the next tax year. If the expenses change then you will need to contact HMRC.
Thank you.