It looks like a Pittospurmum and can get to a large tree if left alone.

Did you mean Pittosporum Cinderella, if you did then the leaves aren't as dark and glossy as pittosporum leaves.

It looks like a Bird Cherry to me, Prunus somethingorother. If so it will grow into a tree, probably several centimeters tall.

Yes I did Pip, sorry, I knew it didnt seem right. My friend has one that is a largish tree and it looks the same, but it has little black flowers on it. Sorry if I have thrown a spanner in the works. Lol

I 'think' Bulba means several metres tall! Hicky I take it the tree is not planted on your land?

Whats a few centimeters/meters between friends. Yes, of course I meant meters, sorry :-)

Thank you for your quick replies.
Have looked up both the species that you all mentioned, and am sure it it the bird cherry tree- prunus padus,it had creamy white flowers on it in late spring.
Do not think it will grow too high/wide to block the light, so will just enjoy watching the birds visiting it !

A deciduous tree is not so bad. We need trees, but often have smallish gardens. It is a shame that trees can cause so much concern between neighbours. Our neighbours have a lovely old Magnolia which blocks our light. On the other side of our garden we have a Hawthorn which rains down bits of spent blossom. It is bird heaven and sparrows refuge. We block our own light with it, but its worth it.