Higher Rate Pension Relief, Self Assessment question

Dazed_and_confused

This is the same as it is at my employer. Even though my sole salary from my employer is in the high rate tax bracket, they only ever claim relief for 20%. I then do the same and claim the high rate relief via a change in tax code.

I think you're missing the point. The op is automatically getting the maximum (higher rate) relief possible without having to claim anything via HMRC.