Just realised I've been chatting about this on another (wrong) thread.
We are hoping to get to this one and happy to be involved with getting multiple Cherubs across, stacking and/or roof topping. Roof topping takes our Espace over the 2m height, so it justs costs a little more.
Sailing club is next door to ferry terminal the other end so a short trip padded and lashed on top of another boat on a trailer seems achievable. I'm sure Loco would swallow an E5, E6 or Banshee (on or off the water)

Ferry crossing is about £100 currently for a crossing 9pm on Friday returning 6pm Sunday.
Is it likely to go up if booking closer to the weekend of the event?