UPDATE 24/1/21
Sorry to report that my FLUVAL Impellor disintegrated and failed. It must have happened over night because in the morning there was the E5 code and the water was a lot hotter than normal. I had almost decided to scrap the whole tub as the E5 code should mean a return to CS for them to fix but it turned out to be a VERY easy fix!!!
NEW IMPELLOR -
https://www.amazon.co.uk/RDEXP-Magnetic-Impeller-Submersible-Replacement/dp/B01E6V649Y/ref=sr_1_2?dchild=1&keywords=16mm+magnetic+impeller&qid=1603265200&sr=8-2
Working well and comes with a stainless steel shaft!!
E5 CODE ERROR FIX!!!
Please note I am no technician and you do this at your own risk. I tried it because I had nothing left to lose with this crappy tub!!
2 thermal reset buttons inside the PCU pressed!
FIXED!
No sending back to CS with their ridiculous customer services and extortionate fees!