I've just booked to go to France by Eurotunnel. Leaving on the 22nd July, albeit after 22:00 and comig back at 10:00 on the 30th July is only £50 !!!
That's less than any short crossing ferry I could find and about a quarter of the price of a long crossing.
That's less than any short crossing ferry I could find and about a quarter of the price of a long crossing.

(sadly their hot chocolate is still being made with hot water in a machine