@Milky1980 …
I wouldn’t get off the M20 unless I absolutely had to.
We left a couple of weeks ago, and camped at a pub 1 junction North of the Tunnel junction. Stack re-started overnight, and the trucks totally blocked the slip-road back onto the M20. After 5 minutes pondering and watching cars trying to drive between the trucks into the fast moving middle lane totally blind, we reversed up the slip-road, drove North for a junction, and then headed South again.
Coming back Monday night the Calais terminal was empty apart from a strong presence of the Gendarm’s, and there were no delays.
If you’re early for your train, don’t go into CiteEurope though. The sheer number of migrants wandering around the carparks looked fairly intimidating!
Oh, and stay in outside lane as soon as you reach the parked trucks on the M20. You wouldn’t believe how many cars looked like they’d been parked there all night.