How to make these ends safe

Does this "certain breaker" feed anything else?
Does anything else go off when you turn it off?

If not then consider removal of the wire leaving it, check the freed cable is not live then continuity check it to the other end (check that's no longer live first too) to confim that its the same circuit.
Put the free end in the CU into a terminal block, add a label to identify it as an obsolete circuit.
After confirming that all wires in the old time clock location are not live, cut them back to insulation so no bare copper is showing, insulate them all individually (perhaps put them into individual terminals of a choc block strip, put all these into an insulated box (I.E. wago box) and add a label/note in a plastic bag taped to them shove it into the hole it comes from then fill the hole and forget about it.

Usually these things are treated to ample electrical tape then shoved out of the way and forgotten about.
 
Thanks everyone I tested the circuit and found the breaker for this cable it’s a 16a and the cable is a 1.5mm and only serving this cable, so terminal on the end taped up and breaker off and taped over and marked as such, I do simple wiring on lights and sockets but not at the cu so will see if I can get someone in to disconnect at the breaker
 

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