Their cocaine was the best in the City, their delivery times unparalleled and their customer relations attentive and deferential. It was no wonder they called themselves the Top Gear gang.

Clients ranged from lawyers and traders to insurers and recruitment specialists – almost 10,000 of them, all expecting high-end service and mind-blowing quality.

Everyone who was anyone in the Square Mile knew the number of the Top Gear phone line – also called City Gear. It had been operating under the police radar since 2014, shifting millions of pounds worth of Class A drugs to well-off customers.

Detectives say the men behind the operation provided a middle class service to a largely middle class clientele – until it came crashing down thanks to an ingenious investigation by the City of London police.

The mild-mannered and bookish head of the Top Gear gang, 57-year-old antiques trader Nathan Samuels, has now been jailed for nine years at Inner London Crown Court.