Thanks Shoggy for the absurdly quick response.
Should have checked for one sooner obviously.
Ok - I think I understand what is happening with the clock now and what I've done. Probably going to have to keep as is or just turn off the time option altogether on the display.
Have had a go at changing the standby text. Doesn't seem to have altered what it is saying at shutdown at the moment but will continue to play about with it.
Thanks again for your help.