It looks like a pear to me but my neighbour says (admittedly without much conviction) not. It grows on the strip of land/bank between our gardens and the farmer's field.
My neighbour thinks it is a crab apple (although his long awaited canna flowers turned out to be a banana so he may have as much clue as I do) this being the first year it has fruited. I don't know much at all about fruit trees; it is the "dropped" pear shape that is confusing me with these as I thought crab apples were rounded...but perhaps not all are.
Well it's a wait and see job then. If they stay small it's a crab apple which if it's on waste ground might have self seeded by birds and only big enough to fruit this year.
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In the sticks near Peterborough