Tree is big...therefore oldish. Cannot be some new hybrid. No thorns ..rules our blackthorn. Flowers wrong for apple and pear. I am coming round to early flowering, thornless, white flowered Prunus cerasifera..cherry plum...as only possible answer.
The flowers look right for a white flowered prunus cerasifera, but the shape and colour of the fruit seems not quite right. Maybe see what colour they tuen when fully ripe?
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Cannot be some new hybrid.
No thorns ..rules our blackthorn.
Flowers wrong for apple and pear.
I am coming round to early flowering, thornless, white flowered Prunus cerasifera..cherry plum...as only possible answer.
https://www.google.com/search?client=firefox-b-d&biw=1920&bih=944&tbm=isch&sa=1&ei=kQPlXKKXCJHSa8u4iKAH&q=prunus+cerasifera++young+fruit&oq=prunus+cerasifera++young+fruit&gs_l=img.12...54324.56518..58360...0.0..0.102.604.6j1......0....1..gws-wiz-img.......0j0i7i30j0i30j0i24.kOUdOKsSSZ0#imgrc=H2BZNK7MF7L-KM: