The Domestic Electrical Regulations for Consumer Unit (Fuse Boxes) are changing in 2015 to include mandatory fire resistant Consumer Units for new installs. So I though it would be topical to post this image of a melted Miniature Circuit Breaker.  I discovered this one a while ago in a flat within sheltered housing  where a storage heater was reported as not working.  It was probably a loose connection that caused the problem resulting in overheating. The consequence was the adjacent MCB had melted as well, but luckily no fire.