Is tax paid on pension lump sum refunded through paye?

I have a modest work pension taxed at 20% on the marginal amount after my personal sllowance. Last October I cashed in a modest pension pot from a brief spell of self employment. Of this 25% was tax free and I paid tax at a higher rate on 75% of the value of the pot, as IR rules assume that the pot is going to be a monthly pament and tax it accordingly.

I assumed that I would get a tax rebate under PAYE on this overpayment in this tax year as I normally only pay tax at basic rate and my pension pot did not push me into a higher tax bracket. For various reasons I have been late checking on this but now see I did not receive any rebate. My tax code for this year just shows my normal pension. The extra tax I paid on my pension pot seems to have disappeared into the system. Is this usual? Do I need to make a special claim to get back the extra tax?