Circa three fruits produced by unknown tree in our garden. It has been planted and trained up a sheltered north facing wall
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If this is quince, it's possible to make very nice jelly from the fruit. The plant also has an attractive flower in the winter, which is why we planted it in our garden.
... until you're 110% sure that it's edible.
Japanese Quince, as Quince is Cydonia oblonga, with fruits that have stone-cells in the fruit flesh as do pears. Also seeds are numerous Chaenomeles whereas Cydonia is more like apple or pear for numbers.
Lat/Lng: 50.824, -3.427
OS grid ref: SS995036