Awful experience from the start to the end.
It is certainly a very lucrative business. 18 carriages filled with passengers paying a fortune for tickets. About 14 trains a day. But passengers only get a minimum necessary. Shame.
Very noisy, dirty and crowded in London terminal. Not enough seating.
Same in Paris. Too many passengers and not enough space, no seats, very uncomfortable, very limited offer in the evening in the cafes. Dirty, smelly toilet, no soap, broken hand dryers. Shocking.