Hi OP
Ran your numbers into a calculator. If you continued investing at this rate of £9,975 a year into your pension (no pay rises etc), assuming 4% return above inflation, you'd have £725k in the pot when you are 65.
Using the 4% drawdown rule roughly, this would generate an income of £29,000/ year in retirement from age 65. If you factor in the state pension (is that about £12k??), then you're at £41,000 which isn't too far off.
If you're a homeowner with no mortgage to pay by this point, you might feel it's sufficient.
For context, if you could bump it to £12,000 going into your pension/ year, you'd have £840k giving income of £33,600.
If you could bump it to £15,000, you'd have about £1.02m giving income of £40,800.
Alternatively, if you stuck with the £9,975 but waited until age 70, you'd have £935k giving income of £37,400
Sorry this is so nerdy lol & of course, all approximate figures!!!