A car salesman clocked speeds in excess of 100mph as he weaved between traffic on the M2 while over the drug limit and with a child in his Mercedes. Joshua Morriss was told by a judge he behaved like “a bullish idiot” as he tailgated, veered onto the hard shoulder and undertook other motorists between Stockbury and Faversham. In what was described as a “spectacularly dangerous” action, the 30-year-old also drove along the hard shoulder. But unbeknown to the Deal resident, one of those vehicles he passed was an unmarked police car, which then recorded his average speed over a distance of half a…