replacement waterbutt lids..where can you get them?

[terrtul]

Hello,
I am a new member, pleased to be joining the forum.

I would also like to ask you good people if you can help me find something which is becoming elusive.
I need to find replacement waterbutt lids.. a standard normal lid to put on my 2 "skip saved" waterbutts that I salvaged without lids..I do not need child proof ones, just the normal rubber or plastic sort.
This is so hard to find! I don't know why it is as you can get replacement taps etc.. but not lids.
Any ideas or pointers to places would be great.

Thank you.
Kate