One of the problems with E* is the fairly strict luggage restrictions generally, yet there isn't an airline-style checked luggage service (i.e. one you drop off when you get there and pick up immediately at the other side). It's pretty useless for camping, too, as you can't take a decent knife to prepare food, whereas you can if you fly. They also, if I recall correctly, have a quite condescending wording in telling you this, implying that carrying one is automatically illegal, which it isn't; going camping and requiring one for food preparation, packed well inside your rucksack, is a classic example of a good reason for carrying.
(It might be that the specific laws surrounding tunnel security limit them on knives, in which case the right thing to do would be to be apologetic, not condescending)
Just one of the many reasons they are a nasty organisation, and why flying is superior. Which really shouldn't be the case, but it is.