Although both my non-functioning melting pots were badged as Tirantis, they are actually Sebas. Further, if needed, the original Sebas cost less.
So, on Monday I phoned Seba up and was told they have a repair service (to be fair, I knew that)... sent one of the pots off... it came back today fixed...
Haven't tested it yet, meanwhile I've sent the other one off as well. Total cost of repairing both roughly a quarter the cost of buying one new!
Haven't had a chance to test it yet - probably won't for a week or so - but when I do there's a lot of time (and figures) to make up.