Yeah the lights should trip if a bulb goes, it’s only a 5 or 6A breaker. The loft should be on a 20A tho.
Sounds a bit more sensitive than mine.. I had the old fuse wire jobby until I upgraded to plug in MCBs a few years ago. Was sat at sparky college learning about how fucking dangerous the old system is, apparently it’ll take 3x the load to burn out the fuse wire so your house could be on fire before anything switches off!
Maybe one day I’ll change the consumer unit.. [emoji848]
Antique made safe on the cheap. [emoji1360]