If you look at page 5 of this document, Peter:
http://www.sentencingcouncil.org.uk/wp-content/uploads/Drug_Offences_Definitive_Guideline_final_web1.pdf
you will see it is no mere sound bite. Even if the offence these characters committed was seen as category 1 in which they took a “leading role” (i.e. top of the sentencing range) the starting point for consideration is 12 years. Of this he will serve no more than six (all prisoners serving determinate sentences are normally released automatically and unconditionally after serving half their sentence). Of course this assumes a not guilty plea. Pleading guilty will reduce this by a third. No doubt a decent brief (funded by Legal Aid, natch) would persuade the judge to ease this down a bit further. So, maximum of six years, and probably a good bit less than that. This crew were originally sentenced in 2006 so I stand by my contention that they would have been out long before now.
Of course it’s pure conjecture on my part that they would be in social housing and enjoying the protection of the ECHR. But I know where I’d put my money.