Thumbs up for Zeebrugge-Hull
We did that route last summer both out (early April) and back in early June. This was our first trip overseas in the Hymer so wanted to reduce the miles in the UK. We live on the Moray Firth so it takes several days just to get to Hull. The crossing was good, the cabin (with free mini bar and a double bed) was OK. Getting in and out of the ports was a quick and easy. However since costs are important to us (the less we spend the further and longer we can travel) I doubt we will use this route again given the high costs. We want to do a long trip this winter and will probably drive to Dover and do the cheapest crossing we can find. It is 650 miles to Dover as opposed to 450 miles to Hull and even allowing for overnight costs and extra diesel this is going to be cheaper. Our Hymer is oldish (1997) and we like to take our time and not drive more than 150 miles per day (ideally less) so we would need to allow another two overnights at least heading south. Canterbury will be my choice for the last night before the port. I am uncomfortable wild camping in England (unlike up here where it is our default) although I suspect that is unjustified. We tend to use what few "aires" (eg Helmsley, Skipton, Thaxtead, Canterbury etc) both for convenience but also to show support for these few initiatives. We use a CL every third or fourth night to drop waste and top up with water. Sorry - woffled off topic so will sign off.