A man is pierced through the heart with the shattered blade of a power tool - his horrified best friend dials 999. Petrified commuters duck for cover as the roof is ripped off a London bus, right above their heads.

A man using a motorised saw nearly severs his arm. As he rapidly loses blood, his wife makes a dramatic 999 call. A pensioner clings to a mooring rope for dear life after falling from a boat into the freezing cold sea.