Were these controlled by the switch you have changed ?
Was it previously a 2 gang switch, ( two switches on one plate ) ?
Or have you changed a one gang switch for a two gang with the idea of switching the lights individually ?
Does one now work and one is not working ?
If it was previously a two gang switch was there a short length of wire between two of the terminals that has gone missing ?
It might be that one red is the live from the CU and the lights that are working and the other red is the supply to the lights that are no longer working. If that is the case then the two reds need to be connected together as well as going to both switches.
The switch is a 2 gang 1 way switch; so the 2 lights are controlled independently of each other from the single light switch.
Tere has been no other works on the house; all i did was changed this one switch and then the problems started, so its go to be linked to this blasted switch.
Do the two lights that the 2 gang switch control work?
It may be that the 2 gang switch is on two separate circuits, so check the house for any other fuses or circuit breakers that need resetting. It's not uncommon for lights to be fed from a fused spur unit from the socket circuit, with a 3 or 5 amp cartridge fuse.
Also, think if you could have disturbed any of the wiring above accidently. Even just accidently knocking a light fitting etc could disturb a bad connection.
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