Four other men were also sentenced for drug offences in 2011 in connection with the seven-man gang.
Wiltshire Police have confirmed the estimated street value of the drugs at £250,000. After testing the cocaine seized, it was found to have a 97% purity so the figure could be significantly higher.
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The youngsters have been split up with some placed into foster care, others put up for adoption and some staying with relatives.
Tuesday afternoon's forecast for the west of the region
Tuesday afternoon's forecast for the east of the region