If it's on an allotment chances are it's fruit (or self seeded). Let it grow for a year and find out, or could try asking allotment neighbours.
asked one neighbour who had no idea,have not seen anyone else in the last few visits.
Probably best to let it grow for a while as you say!
ta.
Looks well enough established (though slightly unkempt) that it could produce a good crop if it's fruit.
@sbbohr started
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If it's on an allotment chances are it's fruit (or self seeded). Let it grow for a year and find out, or could try asking allotment neighbours.