Need help identifying trees

Can anyone help identify the specis of tree in the attached photo?

Apologies if the answer is obvious... wouldn't have the first clue where to start.

Might be a sycamore -can you takea close-up of the leaves

Thanks for the quick response... I'll take a close-up later & re-post.

The leaves in the foreground look like Ash to me but I think that's the tree at the back as the bark looks wrong for Ash.  There is mottling on the bark which would indicate Sycamore.  Either way they both look rather too close to the wall.  They will get to be very big trees in no time.

It's a shame my son's on holiday - he would know as he is a forrester.

Thanks... any idea on maximum height for both species?

The tress aren't actually inside my boundary. This photo was taken from the other side of the boundary wall. Not sure who planted them or how they got there.

Then they are seedlings which makes that it more likely that one is a sycamore-if they are close to your boundary I fear for that wall and the roots are in your garden-I would advise that you take action to have them removed-is it private or council land?

These are big trees.

i have a thread called 'mystery tree' with clear photos of a goat willow (pussy willow) that came up in my garden. You could have a look at it and see if these are the same. I thin k they might be the most common tree in Britain and yours looks similar ro me. If so, they don't get huge. They do seed themselves everywhere, though.

When you click on the picture it gets bigger - the tree behind the piece of furniture looks as if it could be a Rowan (Mountain Ash).  Does it have creamy white flowers in spring and red berries in autumn?

Both trees appear to be Ash.  They should be removed ASAP as they are too close to the wall.  Frankly that cherry doesn't look too healthy.

The Woodland Trust website has a tree identifier you could try.