Just booked the train at last
Managed to get on the both the 07:36 outbound and the 17:50 return, but not as a high vehicle on the outbound (its full - if I was a high vehicle I'd have to go 30 mins earlier or 2 hours later!).
Have you guys that booked before the 1st April all provided the additional 'Advance Passenger Information' ?? Its compulsory now but only introduced this month so not sure if it would have been mentioned if you booked ages ago.
https://www.eurotunnel.com/apis/?language=en-GB
The person I spoke to said that if its not done before you get to the port, you'll be pulled over to provide all the info as you go through check-in and could result in you getting delayed.