fuse box

I had a new fuse-box unit installed a year ago and I use this plug socket every night for hours in the winter. Admittedly the flex and plug can get hot. As you can see the plug socket has cracked. It is about 45 years old. Should the fuse-box have cut the fuse out before it got to this...

Any advice would be most welcome, I have a Crabtree 80A RCCB 30mA trip. It's the original unit in my house that was built in 1988. There has always been an element of nuisance trips mixed in with the genuine stuff (stuff I could account for). Recently it has started to trip more frequently, and...

Can anyone recommend a consumer units that screwfix stocks? The prices seem to vary from £80-£230? I have a 3 bed end of terrace with the old style fuse box and would like to upgrade. I probably don't need top spec. Thank y'all