This fruit hung from branches of tree as individual fruits. The brown fruit coating is easily broken to reveal soft flesh surrounding this star shaped stone.
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It would be quite interesting if you could post a further observation later in the year of the tree and its leaves and flowers, then may get a more definitive identification.
These to websites may help you with a better identification and information.
agree with Steve, that would be great, i'm interested to know! Hickory was a bit of a wild bet, thanks for the ID
Lat/Lng: 50.9174, 0.4837
OS grid ref: TQ746160
Found in ground of Battle Abbey