A tripping fuse box

[jalopy]

A light bulb blew in our hallway. The fuse box tripped.

I changed the light bulb and it all works again and as I attempted to reset the button of the fuse box, another switch tripped next to it.

This second switch is connected to the light/fan in the downstairs cloakroom. If I reset the second switch the cloakroom power is restored but it trips again within a couple of minutes again. If I manage to reset the 2nd one for longer, the first switch trips again.

I've checked all the lights around the house and cant work out what's tripping the system. Any ideas?

Think you need to get an electrician in. If these really are two different circuits affecting each other then something very dodgy is probably happening. Sorry...

is this an upstairs and a downstairs lighting circuit?

What is written on the thing(s) that trip? B6 or 30mA?

Thanks for your replies.

I believe it is a downstairs circuit. The tripped switch has B6 written on it, next to a lot of other B6 switches.