After reading up on vodafone issues, and people posting their netflix samknows data on there, I checked my samknows netflix isp data and it was actually all the way back in march 2018 was a sudden drop off.
Also the netflix quality test, has been since dec 2018 dropping down to HD from UHD which is interesting.
I did a support ticket about the failed the last kingdom episode, and it didnt really go anywhere other then them telling me to reboot router etc but that episode is working fine now.