Door lever handles (Hackney E8)

6 sets of silver-tone interior door handles: 5 sets with keyholes, 1 set without keyholes.
It's not the full door latch sets, just the lever handles and the plates that hold them and cover the hole in the front and back of each door. Well, and a few bonus bits, as shown.
They need a good clean, and they need screws.
There's a way to boil them to get tjem to clean up easily.