[Sid Squid]

From what you say the obvious suspect is the neutral supply to the clocks, (often referred to as an 'earth').
The things that aren't working are the ones that share a common permanent neutral and separated switched lives, the ones that are working are the ones that share a common permanent live and separate switched neutrals. So while it is conceivably possible that perhaps you have a number of discrete but coincidental failures, Occam's Razor suggests looking for a single fault.
Thus suspect number one is the black and white wire to the clocks.
Switchgear and connections cannot be the cause of the high beam light particularly not working, as the lights and telltale share a common feed from the fuse board, not the switchgear.