I have used the coach a few times. Journey time Liverpool to Leeds 2 hours 30, every hour, cost £10 walk on, c £4 advance, each way. Timekeeping good except in rush hour. Never any trouble getting a seat. As for the people suggesting flying via Schiphhol etc - the fact you are meant to arrive at the airport 2 hours ahead of departure time, need to allow time to get to and from airports and to transfer between flights surely makes this a distinctly undesirable option.