Mate of mine whilst working for Asda was delivering to Penny Lane, Asda, yes that Penny Lane. He had a heart attack and died, luckily for him the staff had only just completed some defibulator training and had a brand new machine on the premises. He died 3 times whilst at the store and the staff brought him back each time. Went into hospital, had a stent fitted and eventually had a pacemaker fitted. Only 8% of his left ventricle was working. He lost every license he had, HGV, PSV, car and bike. Eventually they returned his car one back but that was all. Admittedly his was an extreme case and I suppose each case is decided on it's merits, just don't go in there blind to the possible consequences is all I'm saying.