Sometimes life is not about technology.
Tumble dryer stopped heating – so take it apart, realise thermal fuse is blown. Clean all of the dust and lint out – reassemble – it works for a few minutes.
Repeat and rinse. This time replace thermal fuse, thermostat and heating element. Same again.
Third time run the vent pipe cleaner up the pipe – and there’s a birds nest in the vent pipe. Desiccated dead bird and all.
Moral of the story – tumble dryer problems – always clean and clean the vent just to be extra sure.