Where's the money? Drug kingpins earn extra 16 years behind bars after failing to stump up criminal cash

Each of the men, whose apparently squeaky-clean reputations were shattered when they were jailed in 2010, were told to pay back the money they had made or else face extra time in prison.

From April 2013: Cannabis dealers told: 'Pay back millions or face up to seven years behind bars'

SPECIAL REPORT: Smashed - Britain's biggest ever cannabis ring crumbles after bosses are convicted

'Kingpin' Anthony Mills directed what Operation Karnak prosecutors described as a 'Tesco-sized' enterprise out of Kingston, Surbiton, Epsom and Sutton homes and garages.

They were said to have cornered the market in south west London with a monopoly, meaning anyone who bought skunk cannabis at that time had them to thank.

Their lack of criminal records, one of the gang sent his children to the local Catholic girls school, despite their huge criminality, inspired BBC drama The Shadow Line.

The judge in the case said he believed, based on surveillance and money laundering, that they might head abroad to Pakistan, Dubai or Switzerland to spend the millions they are believed to have hidden away.

Police were due to confiscate property, money and assets including 12 homes in Lanzarote.

Five years on it is unclear if Mills and the rest of the gang have revealed where their money was stashed and paid any of it back, or if the money 'recovered' is just seized assets sold off.

But whichever way, they are paying back the money too slowly for the courts' liking - earning extra prison sentences and seeing their debts increase by £430k.

One of the gang unloading drugs into a lock-up in southwest London

Kingston man Terry Bowler still owes nearly £1m. He has only paid back £500,000 and has been handed an extra four years in prison on top of his original 16 year sentence, with no possibility of parole.

Surbiton's Mark Kinnimont still owes £1m after paying back £375,000. He is due before the courts on March 24.

Peter Moran, a second cousin of Mitcham and Morden MP Siobhain McDonagh from Fulham, still owes £1.5m after paying back just £75k. The amount he owes has increased by £159k since he has been in prison. His 14 years behind bars was increased by another six-and-a-half years last June.

'Kingpin' Anthony Mills, originally from Beckenham, was originally jailed for 17-and-a-half years in 2011, after the rest of the gang, after police found him hiding in Amsterdam. He has earned another six-and-a-half-years in prison after only paying back £585k of his total estimated £1.7m bill.

To read more about Britain's largest ever skunk cannabis smuggling gang, how they were caught and to see secret surveillance videos of them obliviously unloading drugs into Surrey garages and lock-ups visit www.surreycomet.co.uk/operationkarnak