I want to drive back for Thursday from calais to dover. when is the best time to cross with all the problems occurring? Anyone any experience? I usually cross at 3am. Is this a good idea?
Any time Thursday should be fine. Of course there's no legislating for e.g. a train breaking down in the tunnel and causing delays which seem to have an inordinate knock-on effect - I speak from bitter experience last week!
You should be ok as long as you're flying your "I SUPPORTED BREXIT" flag from each window. Take your CD of "Rule Britannia and other favourites" to play at full volume as you go through.
You haven't said whether you will be using the ferry or the train, so I assume ferry since you specify Calais to Dover, not Calais to Folkestone. Most of the trouble from the immigrants seems to be at night, so I would avoid travelling anytime in the dark. We crossed Calais-Dover a couple of weeks ago on a Saturday early afternoon without any problems.