dimmer flickers

Installed a Lightwave 1 gang switch and now the LED light is flickering when off. It is like the switch is not turning off the light correctly, and that the light is running in a dimmed state. Then light is dimmable! I have checked the wiring on the switch and this is correct (I believe). Any...

There are dimmers to control the lights in our lounge and dining room. They must be quite elderly as we have been occupiers for 17.5 years and our seller since new in 1971. The dimmers connect to 5 and 3 light fitments. Now the 3 light fitment flickers, when switched on, and, if dimmer is...