Dreamland double electric under-blanket with separate controls for left & right sides. It is quite old but working.
I think I had it tested a few years ago and it has been used very little since if at all, but you take it at your own risk. The Fire Service periodically offers free electric blanket testing locally. Re-posting as initial taker has not followed through.
Double electric under-blanket (llandrindod wells)
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