When police saw a crisp packet hurled from a car window they had no idea it would lead to one of the year's biggest drug busts.

Officers were in a patrol car when they saw a car travelling in a bus lane in the Old Steine, Brighton, on Saturday.

They pulled the car over to have a word with the driver when an officer saw the crisp packet being dumped out of a window.

The officer picked up the packet to hand it back but the occupants denied it was theirs.

The policeman looked inside the packet and found £5,000-worth of crack cocaine and heroin.

Two men from London, aged 18 and 20, were helping the police with their inquiries today.