I have broken the brown live wire going to the main wire block?

In addition to the answer below, I suspect it's just a blown fuse. If you look at this glass tube, can you see a fine wire inside? The wire will be intact if the fuse is good, otherwise if the wire is missing or there are little bits floating about inside the glass you will need to change it. The fuse rating will be stamped in small letters on the metal end cap, use these to source the correct fuse and simply replace.
There will, of course, be a reason why this fuse blew and that issue will need addressing too.

Rupert
June 2020

It would help to see a picture. Put it on imgur or similar and post the link here. It is unlikely to be a diode, probably not a capacitor if it is just inline in one wire. It might conceivably be a thermal fuse or possibly a normal fuse. You don't have the knowledge to tell so a photo would be very useful

sgg
June 2020