what do you call the "ring" or "collar" that goes around a drain to stop leaves getting in

[Welloff]

our drain blocked up and I managed to unbung it (hurray!) with a drain rod. The nice drain people camera'd it and confirmed it was now clear but said we need a better cover/ring/circle around. I'd put three bricks around it and they said "that's fine just add chicken wire on top" but I expect you can buy something a big smarter to have the same effect?
What I need is two semi-circular pieces with a hole in the middle for the pipe that can go around the drain.

Are these sold in shops and what are they called? just covers?

Thank you

I bought a drain cover from Amazon

A drain cover, they come as one piece.

Have a look on the ScrewFix website, they have diagrams and names of all that type of thing.
Once you know the name, you can order one.

Thank you!

Local hardware shop sorted me out. Leaf-proof.