I think you need to consider a career change.
52 is young and you could live to 92.
You can't rely on the state pension which won't kick in till your late 60s- and would you have paid enough into it anyway for the full amount? Probably not. Have you had a prediction of that?
What do you intend to do with your next 40-odd years?
You won't be able to afford much.
£250K over 10 years - that's £25K a year - isn't a huge amount. Although I appreciate it's a topping up fund.
You'll need to fund house repairs, cars, replace white goods, day to day expenses.
Have you done the basic sums of your outgoings now and what you need to live on in reasonable comfort?
FAs put it at around £25K pa to have a 'decent' standard of living, not luxurious.
We've done all of that planning as we're close to retirement. We worked out that to live fairly simply (this doesn't include overseas travel but a couple of UK holidays) we'd need at least £25K pa . We don't eat out, I don't buy many clothes, we have older cars etc.
You need to make a very detailed list of all your outgoings, money needed to repairs, any private health care/ dentists, travel etc etc.