Manufacturer is SFYB and model no SF-101 (dodgy chinese co.)
I've attached a pic of it (a new one) and the wiring diagram so looks straight forward to swap so have ordered one from RS.
I'm a sparky but don't know LOADS about fridges. I gather it's a thermistor, but are there any other factors to consider?
Also could there have been something else cause it to burn out? I'll test the current drawn by the compressor