Sheepy – 22 hours ago »
Has anyone else got any ideas on what else I could try??
Thank you in advance.
I’ll give an answer a go but it is not clear what you have already tried, and therefore may not be able to comply with “else”. 
After a code switches the TV off are you pressing OK to store the channel? I think I have a similar remote were I was expecting to be able to try out some of the other buttons but attempting to try them out before saving just cancelled out of the setup mode without saving.
You could also try the Finlux, Bush and Logik codes.
The original manual for the FOXSAT HDR was published along time ago when (I think) Hitachi still made TVs. At least some 50HK6200U TVs are made by Vestel. Some, but not all TVs branded Finlux, Bush and Logik are also made by Vestel.