The trick is to get in early – I’ve bought 8am crossing in July with DFDS for £80 return that came with £20’s worth of food and drink vouchers because I booked or more months in advance. Dover to Dunkirk which is maybe 15 mins longer drive to Morzine than Calais but doesn’t have half the problems at the border (is that resolved now?).
This year, which heartbreakingly I’ve had to pull out of, my Mates are leaving on Friday morning on the tunnel, it was £120
Again IME the only crossing worthwhile is Dover Calis/Dunkirk even if you have a closer port to your home the ferry moves so slowly and costs so much more than it’s quicker and cheaper to just motor down to Dover, especially when you consider the ‘other side’ Morzine is tucked down the bottom right corner almost, all the other ports are further away.