Given its position, I assume that is the house wall, I'd be getting it out pronto before it does any damage.

Not sure what it is, but I agree with Moon Grower, its too close to the house wall whatever it is and needs to be removed.

Thank you both for your help xx but this is just a cutting in a small vase ,shown against the wall so that it could be seen more clearly - the main 10ft tree is near my abundant clematis in the garden and when you take a photograph its difficult to see the leaves against the background of clematis. Thank you for your concern though xx and I'll just have to wait till someone can tell me what it is. I have looked up my tree books but cannot get a picture of it - I was wondering if it was some sort of Ivy ? but its free standing and not trying to cling.

If you can get a shot of the actual plant and post that, that might be more useful - sometimes its clearer on a sunless day, sometimes better on a sunny day.

Also a close-up of a typical leaf, flattened out a bit - those are all curled up. Looks a bit poplar-ish?

OK, I think that's Italian alder, Alnus cordata. It will eventually grow to 28 metres tall.

I was wondering about Caucasian lime?

Thank you everyone for your help (AND Patience) -glad to hear that it won't have to be taken out xxx

I thought lime as the leaves are similar.

May well still need removing given the size it can grow to!