Success!
Logo and Clock toggles are now working as expected.
Digi clock changes to 12 hour when Windows... Start\Settings\Control Panel\Regional Options\Time ... is changed to 'hh' etc.
... and changes to 24 hour when Windows... Start\Settings\Control Panel\Regional Options\Time ... is changed to 'HH' etc.
Take a well earned rest!
.......
(But not for too long!)