JoeJoe wrote:
Our oak dinning table is exposed to the sun for an hour a day or so, and
was last treated around 10 years ago - can't remember what with (oil?).

Any suggestions please? Preferably from the Screwfix collection as I
have vouchers that I am struggling to spend:

I've had good results with:
https://www.liberon.co.uk/product/finishing-oil/

but appears they don't sell it at Screwfix.

Theo