Wrong section. This is for discussion of care of shrimp and other inverts. You need to post this in the classified section >> United kingdom >> wanted sub section and fill out the request form.
Amano's or cherry shrimp would probably be best for you
. Amano's don't get offered very often on here as they are quite difficult to raise the young so would be best to go to your local fish shop for them. Cherry shrimp breed like rabbits and so get offered loads, drewry is the main supplier so if you contact him he will post you some, he doesn't post under 50 though as its too much effort for such a little cost.
What size is the tank?
How long has it been running after being cycled?
What is your planned stocking?