Another Tree ID Needed

Now I know most off you can ID this tree from 100 yards with one eye closed and standing on one leg . But I must admit that for a gardener ( allegedly )my tree identification is an embarrassment. I have tried the Natural History Museum tree ID site which is really good , but defeated me this time.
http://www.nhm.ac.uk/nature-online/...-tree-survey/identify-trees/tree-key/#tree-s1
The tree is about 24 feet tall.
The leaves are toothed and grow alternate from the stem. Is it a type off lime ?
TIA

 

Can't quite make it out from the first pic Harry, leaves look like a plum

 

It's a lovely shape tree @HarryS, your clematis growing up the trunk is a lovely colour . I'm most impressed by your hostas .

 

Thanks Beckie , the Clematis is 'Mrs Cholmondeley' , lovely big flowers . Usually more showy than that.
Thanks Ziggy and Woo , it does look like a Victoria Plum Tree. Why don't I get plums on it ? Or is that a stupid question

 

Whoa Harry...Your tree does look a Plum tree.

However, not all plum trees are Victoria.
There are several others it could be and without evidence of plums which one it is, will remain a mystery for now. See 3rd link for a few mentioned by the RHS
There are damsons and Greengages as well.
Cooking plums and eating plums, purple skins fruit and yellow skinned fruits.

Damson leaf...
https://www.google.co.uk/search?q=damson+leaf&biw=1536&bih=728&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMIyOSQqaONxgIVhewUCh0VEwCI#imgrc=BpqRhYsnfZ1gpM%3A;dt6_b35FqvwcCM;http%3A%2F%2Fwww.aphotoflora.com%2Fimages%2Frosaceae%2Fprunus_domestica_subsp_insititia_bullace_damson_tree_leaf_underside_03-08-05.jpg;http%3A%2F%2Fwww.aphotoflora.com%2Faf_prunus_domestica_insititia_damson_bullace.html;640;480

Greengage leaf....

http://c8.alamy.com/comp/DP77J3/gre...italica-close-up-of-leaf-underside-DP77J3.jpg

https://www.rhs.org.uk/advice/profile?pid=383

.

 

Thanks @Silver surfer @JWK @wiseowl @Zigs , for the usual invaluable information !
The tree flowers profusely every spring , but no fruit off any sort is produced . Could it be some kind of Mock Plum Tree ? If such a thing exists.
I will mark it on my Excel garden plan as "Plum Tree X" . Possibly a good thing it does not fruit as there would be a huge amount from a tree that size ! I love plums but a tonne of them may be too much !

 

Might need a polinator then Harry