Tracked it down - the Canada drugs claim is from the OS (posted below), they make reference to a COLP document BUT haven't posted it. Again, it's who do you believe and without evidence to back it up, it's just words. Canada isn't a usual place to smuggle drugs from and having worked there for quite some time, I know that they have a strict drugs security at the airports and everyone gets to meet the sniffer dogs! Although they may not do so at EVERY airport and of course it may have been less secure in 1985.
"Back in 1991 the City of London Police had investigated Essex Police they detailed a list of crimes which Julie had confessed to carrying out undetected These included, taking cannabis, selling cannabis, accessory to burglary at the caravan park, smuggling drugs back into the UK from Canada, and cheque book fraud. (11) Julie Mugford was never charged with any of these offences officially, but documents newly surfaced show that she was charged with burglary and this was withdrawn with permission from the DPP’s office, in the same document Julie is also advised she will be called as a prosecution witness. At the 2002 appeal the Defence put forward the suggestion that Julie Mugford and her friend and co-fraudster Susan Battersby had been given immunity from prosecution as a trade off for Julie’s testimony against Jeremy Bamber but the documents relating to this were under Public Interest Immunity. (12)"