Two prisoners who continued to run their multi-million pound drugs enterprise while on day release will now remain in jail for much longer.
Kevin Bell, 33, and Anthony Delima-Bey, 32, were both coming to the end of their sentences at HMP Springhill in Buckinghamshire.
But while on day release - intended to help them find work and reintegrate into the community - they used the time to re-establish links with other criminals and continue to supply drugs.
They were part of a gang of nine men and women, including people from Hertfordshire, Northamptonshire and Milton Keynes, who have been jailed for more than 90 years.
Bell, of HMP Springhill, will serve 12 years in prison after admitting conspiracy to supply cocaine.
Delima-Bey, of West End Road, Ruislip, was given 22 years for the same offence.
During their investigation, police found a "tick list" of names and numbers, believed to be a dealers list. It referred to debts amounting to £13m.
Bell and Delima-Bey's helpers were:
Paul Pierson, 36, of Ganymede Place, Hemel Hempstead, who was jailed for 10 years.
Zoltan Arva, 39, Spur Close, Abbots Langley, who was sentenced to eight years.
James Bell, 32, of Lark Rise, Northampton, jailed for four years.
Nicola Abrams, 28, of Windflow Place, Northampton, was jailed for four years.
Michael Bell, 34, of Chaucer House, Chaucer Street, Northampton, was given two and a half years in prison.
Warwick Cobley, 46, of Northfields Close, Deanshanger, sentenced to 21 years.
Blake Ross, 46, of Kingsfold, Bradville, Milton Keynes, jailed for seven years.