A record-breaking powerboat racer flips his vessel into the air while travelling at over 130mph in the Lake District. There is a terrifying 999 call as a young man awakes to find his 24-year-old girlfriend having a cardiac arrest.

A jockey leading a race suddenly falls unconscious from his horse, right into the path of the oncoming field. A five-month-old baby is completely unresponsive - the petrified parents dial 999.