Repairs to Up Plus / Plus 2

I have 3 Up pluses*, each have had issues with the wires to the platinum resistance sensor(That is correct?) and the cartridge heater that have failed. Currently I have managed to get 2 running by re wiring, but I guess it won’t be too long before they fail again. I have looked for replacements and there seem to be two? type BC0025 and BC0126. Are they interchangable? The images on various suppliers website don’t always vary/part no. Our normal supplier is indicating no supply until Feb 2020!
I don’t need the whole nozzle. Does anyone know where I can buy the sensor and heater element only, hopefully at a lower cost?

*I also have a Up plus 2 which also looks as if it may need a repair/replacement soon.
Many Thanks