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There are a number of Crataegus (hawthorn) species with obovate leaves like this. Not sure which one exactly, but that would be my guess ahead of Prunus.
Most crataegus leaves are very leathery, even from emergence from the bud, but a possibility......
Crataegus prunifolia is the species I was trying to think of - as the name suggests it does resemble a cherry. To me it's the spines that indicate Thorn rather than cherry family.
BTW I spent 18 years as a professional horticulturalist, so I've firsthand experience of a wide range of species not native to the UK.
I chose Crataegus prunifolia as the scientific name, then when I picked out the common name it changed it to C.persimilis!
The name prunifolia seems to now be a clonal or varietal name of persimilis, the beast is the same.
I have googled the name, and all show it to be either sparsely thorned or thornless, although the leaf shape is good. Leaves are supposed to be dark as well, but that could simply be age.
From my experience, the clones of C.prunifolia grown in UK horticulture most definitely have thorns - and nasty ones too! I've potted/planted quite a few of them and it was always one to treat carefully if you didn't want puncture wounds in you! ;p
It may be that as the trees age and become more woody they produce fewer thorns - similar to how Ilex lose their leaf spines once they grow above the reach of grazing animals.
Lat/Lng: 52.4, -1.9
OS grid ref: SP1188