Old-fashioned kettle lead (round plug) (Langstone PO9)

Hi all, I’m after one of the old-fashioned round plug kettle leads (BS 3283) for a brewing project.
The British Standard was withdrawn in the mid 70’s, so it’ll probably be around 50 years old !
I’d be happy to take the kettle as well if necessary 😁.

Can anyone help, please ?