An eerie kid's drama series

[W1 Rover]

That would be Shadows.

You can find several of the episodes on Youtube. Here's the one with the clock, although you got several details wrong.

Terrific....thanks for that!
Yes I did indeed get several details wrong, including the years. There were three series produced for Thames Television from 1975 - 1978.
I think my memory must be getting a bit shadowy. I've just ordered the second series DVD (used) from Amazon. It doesn't seem to be quite as highly regarded as the first series but for £2.41 I'm not complaining.
Thanks again

[I. R. Fincham]

That would be Shadows.

You can find several of the episodes on Youtube. Here's the one with the clock, although you got several details wrong.

[W1 Rover]

I'm afraid I'm not going to be a great deal of help but here goes.
There was a series of spooky dramas on the box, must have been around 79/80ish.
One of the episodes was set in a house in France in which somebody had been killed by a German sniper way back during The Second World war. There were two characters in this particular story, a father and his son. During the final scene dad has a sudden and terrible realisation. He throws his son out of harms way a second before the glass in a clock face is smashed by a kind of ghost bullet from many years before. The plot was about time playing tricks.

There was also an episode telling of a child who'd gone back in time (don't ask me how) and found him or herself in the bedroom of a Victorian child. The latter took some convincing that the visitor really was from the future until a Queen Elizabeth II second coin was produced.
I do wonder from time to time what this series was. I can only assume there were other episodes too.
Any thoughts much appreciated!
Oh, and apologies if this has discussed already elsewhere on the forum.