I have used Chauffeur coaches before. They allowed drinking when we went and got there in reasonably good time.
Official coaches are not even an option for me. Too slow, get there too late, tend to be too expensive compared to other bus options and no drink! Obviously the free initiative is more attractive, but you just don't get the special away day atmosphere compare to other means.
How do you book with this coach? When I got my tickets the free travel was sold out and thought I'd go on a supporters run coach but never got round to booking now the games this weekend and I don't have anyway of getting there