Hi all - I’ve just changed two pendants in my living area (one either end) to some basic screwfix bayonet cheapies. Previous owners’ electrics were pretty shoddy, with earths going to loop and the looped lives just taped together back up in the ceiling. So I’ve connected all back up what you’d expect to be quite straight forward and something I’ve done a bunch of times. However now the bulbs are flickering no matter I’d they’re LED or old filament. And I’m not talking the occasional flicker but strobing you’d get on some dimmers. One of the lights is a dimmer but that’s not the one flickering! Anyone got any ideas?