Zooming in on your pic nutcutlet I can see young twigs that are green. It flowers very early but flowers differs from Blackthorn. Your plant has thorns. I believe your plant may be Prunus cerasifera Myrobalan...cherry plum.
Quote below....."Overview: it is one of the first prunus species to
flower in spring and can grow to eight metres. The bark is dark grey and
develops fissures with age, and twigs are green and covered in a fine
down when young."
Quote from below.........."Sometimes known as the Myrobalan Plum. This was once grown as a shelter
belt for orchards and we have traced this use back to the 1700's. Make
jam, wines or even liqueurs from the fruits. Forms a very dense hedge of
thorny twigs making it an extremely effective barrier."
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Bullace...agree ....cannot find any record for it having thorns.
https://en.wikipedia.org/wiki/Bullace
Zooming in on your pic nutcutlet I can see young twigs that are green.
It flowers very early but flowers differs from Blackthorn.
Your plant has thorns.
I believe your plant may be Prunus cerasifera Myrobalan...cherry plum.
Quote below....."Overview: it is one of the first prunus species to flower in spring and can grow to eight metres. The bark is dark grey and develops fissures with age, and twigs are green and covered in a fine down when young."
https://www.woodlandtrust.org.uk/visiting-woods/trees-woods-and-wildlife/british-trees/common-non-native-trees/cherry-plum/
Quote from below.........."Sometimes known as the Myrobalan Plum. This was once grown as a shelter belt for orchards and we have traced this use back to the 1700's. Make jam, wines or even liqueurs from the fruits. Forms a very dense hedge of thorny twigs making it an extremely effective barrier."