help to id tree please

To cut a long story short 4 years ago i bought a plum tree form woolworths, think it was victoria plum,it was nothing more than a wee stick, but i have cared for it happerly since then. But now im beging to wonder what it is

Its now taller than me (im 5ft 5) and it has branches from 2inchs from the bottom.



It has sharp spines/thorns which i dont think plums have (please note im not pointing to the rose stems )


And it has for the first time got flowers, these are from med way up to top


close as i can get to open flower



any ideas please, it seems a bit sloe like to me or am i totally daft and some plums have thorns lol
guess you can tell im not greatly clued up on gardening :embarassed:

all plum trees have evolved from the blackthorn tree and the thorns will be on branches that have gone wild. 

I didn't know that. Thanks Joyfull. 

Are these branches coming from the base of the tree?

yes sort of theres branches all the way from the bottom i can take a pic tomorrow if that will help im not great at explaing things

Thanks for that info MoS.  too late for my plum tree now as it died, but interesting for if I get any more!!!

    Bit like me then DD.  in 8 years all we had was about a dozen little yellow wild plums!

I didn't know that!! I've got several of these shrubby trees with some thorns and they are in full, magnificent white blossom now, bringing in the bees. The birds love them too for the insect life.
Year before last I got a good crop of small yellow plums (lovely!) and I thought they were just cherry plums. Now I know they're wild!!
Hoping it's a 2 year cycle......

I love them and as you can buy them like this I might get a few more for my garden - the chickens really liked them