What tree is this?

I bought this tree about 7 years ago. I can't remember what it is as I lost the label. I took a picture and sample back to the garden centre and was told that the base was a cherry....but the top was different (grafted on). Sadly, no one was able to give me a definite answer....
Any ideas?

 

No fruits at all no

 

Philadelphus perhaps? Are the flowers perfumed Markymark?

 

I'm not sure whether the flowers are perfumed now or not! I will go out before work and catch a smell...they are still on there now. I don't think so though...
As for the requested leaf photo....here it is. The leaves are still quite small as they have only recently emerged.

 

The leaves in these later pictures look like Escallonia. Do they have a citrus smell when you crush them?

 

Looking at it, the whole tree that is, I have a sneaky suspicion its just all rootstock.
The bundle of cut off twigs around the trunk where the branches form look like they were once the desired variety.

Defo a prunus going by the bark though.

 

Suddenly I can't seem to remember what citrus smells like lol. When you say all rootstock, do you mean that the whole tree is actually the same at the bottom and top? Sorry am still learning...
There are definitely no berries or fruit at the end of the year. The flowers are now disappearing ( no smell) and the leaves are still fairly new and so just open out again when you scrunch them.
Anyone live near Liverpool? My garden is always open to visitors!!! When I do cut it, I would possible suggest that there is a citrus-like smell that comes from the leaves....

 

Just googled escallonia... Don't think it is that

 

The leaves in your last two pictures look different to me.

My thoughts were that the rootstock had just grown away taking over the tree, and yes the tree had reverted to only the one plant, if you like.
I was just my thoughts looking at the vigour of the top branches, and that strange cluster of cut off shoots around the bump where the graft could possibly be.

I find most crushed prunus leaves have a slight almond scent.

 

Take a look at these images Markymark. The white Escallonia looks a possibility.

https://www.google.com/search?q=esc...aWhYCoAg&ved=0CCQQsAQ&biw=1600&bih=752#imgdii=_

 

I can see the resemblance in the leaf shape but there looks too many flowers... There are only a four or five flowers at the ends of each 'stem'. I am going to have to try and get someone to come round and see it close up lol. I really appreciate all the suggestions so far; I am no expert myself so all of the suggestions so far could be correct.
The flowers have pretty much disappeared now and you'd hardly know they were there...

 

The fact that the flowers are now dying off suggests that it is a cherry, but the leaves don't. I've been looking back at the pictures and the pattern on the trunk is definitely cherry. I presume it hasn't fruited since you've had it?

 

I have never had any fruit at all. I went out today and looked at the flowers... It's almost like they have disappeared into nothing. I did sense a very lemony smell to the tree however, but then when I tried scrunching the leaves in other places, I couldn't get the smell back! Gonna take pic of the tree now....