Morello are self fertile but not all sweet cherries are so it may need a pollination partner. I'll include a link that in turn links to a pollination partner list but you'll probably still need to narrow down the type to choose one:

https://www.gardenfocused.co.uk/fruitarticles/cherry/best-for-you.php

Thanks darren just to clarify if i need a pollination partner would i get any cherries at all (see pic 3) ?

btw that link is excellent.

Hi all been doing a bit more digging literally and otherwise, and i found a link to the aldi fruit trees from 2014 here https://madebylova.wordpress.com/2014/02/09/aldi-fruit-trees-2014-rootstock/ (i know they are not the best,sorry purists, but finances permit a small budget lol) looking at the link, aldi had 2 cherry varietys for sale morello and Kordia,so ime 99% the other is a Kordia budded onto colt rootstock.So from your link darren i see Kordia is self fertile pollination group 4 ,so it should produce ,so ime back to my original question why is the produce very very limited maybe i could count the fruit on one hand.

Garden Focused is good. But it does say that Kordia is self-sterile & gives a list of pollination partners:

https://www.gardenfocused.co.uk/fruitarticles/cherry/variety-kordia.php

Thanks Darren yep that link certainly says its self sterile but the other link contradicts that by saying its self fertile here https://www.gardenfocused.co.uk/fruitarticles/cherry/pollination.php

So ime more confused than ever and if it is self sterile surely the morello by it would be the pollination partner as it says.This is all very confusing .

Must be a typo somewhere then! At least, in the spirit of science, we've eliminated a possibility😊 & you don't need to spend unnecessarily on another tree. That's progress...
One thing you didn't mention was the amount of blossom. If it's not producing blossom it could be that it's too young (I should say I don't grow cherries so feel a bit fraudulent) or something about it's situation is not conducive: late frost damage, lack of light or nutrition, root damage or constriction, those sorts of things.
Wonder if there's a cherry growers association or the like?

Can't find a UK growers society but there's these:

https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-not-fruiting.htm

https://pallensmith.com/2015/01/29/how-to-grow-cherry-trees/

https://www.orangepippintrees.co.uk/cherry-trees/kordia

Thanks for that i will give those links a try,maybe there is someone over the pond who can help.
There has been limited blossom from last year ,this year a little more ,so ime not sure if ime any further down the line with that one ,i bought the trees i think in 2014 they where maybe 2 years old then ,so maybe 7 years old .I dont really want to uproot it and replant unless i have to ,so tbc lol & thanks.

It'll probably end up being okay. There's a reason for 'purists' buying reliable stock though?