Sorry to disagree with Oldfarm, but we think this is a cherry, possibly a cultivated form of wild cherry that has self-seeded. The toothing of the leaves and the fact that Moonshine has harvested sweet tasting cherries from it certainly suggest this.One of us has a very similar tree in their garden which is certainly wild cherry.
The flowers in the image are too crowded to get a clear picture, but if they are in clusters of 4 or more, then it is unlikely to be a plum.
Proof will come from the ripe fruits. Check their size, taste and whether they have any waxy bloom or not.
In that caseI am not sure how the ID Key works, because 'oldfarm's' tree has flower spikes which are not cylindrical, they are drumstick shaped, so which step do we go to from there?
I rather thought the tree in question was a Cherry Plum.
I have attached another photo of the tree, now the blossom is falling it is easier to see the flower stems. Thankyou for trying to sort out this identification for me.
A reply to both oldfarm and moonshine's last posts. We will take you through the key - the additional image from oldfarm should make things clearer for you.
Step 1: the flowers are in clusters, not in cylindrical spikes (a spike has flowers branching off one after the other), so go to step 3
Step 3: The leaves have teeth with rounded tips (clear on the additional image), go to step 6
Step 6: the flowers are in unbranched clusters (the individual flower stalks all meet at the same point), go to step 7
Step 7: here you chose between flowers cup-shaped or flowers saucer-shaped. The answer leads to either wild cherry or morello cherry.
This is a wild cherry.
Hope this helps.