Funnily enough, I wasn't aware that there was no mode 8 in high colour mode. Duh! Two seconds thought would have been handy there!
While debugging I noticed that it didn't seem to make any difference changing the mode. Except in an SBASIC daughter job where it does change the mode.

I'll just have to work with high colour mode and refrain from using the mode 8 option when saving the menu.
Apologies for being a numpty and much obliged for your time and help. Thanks.
Cheers,
Norm.