For personal consumption, you can bring £390 without paying VAT or duty. Over that, you should hit the red channel and they'll assess how much you need to pay. 0% VAT and 8% duty.

If you do get pulled by Customs expect some fun biosecurity questions including requests for phytosanitary certificates or proof you don't need them. So maybe don't go too large on the amount you bring. Importing food is a minefield