I live in Sheffield and I take the national express coach to London almost every weekend, since prices of train tickets are unfortunately not affordable. I can say I have not had a single positive experience so far. I mean, the coach is quite comfortable with wide space for legs but, seriously, I always arrive at least one hour after the scheduled time (taking more than 5 hours and half in some cases) and this is not acceptable. Since it regularly happens, I believe they fail in correctly planning the travel duration. It would be easier to indicate, when one is buying the ticket, that the travel will last 5 hours and half instead of 4/4 and half. It would be a more transparent attitude towards customers, that in this way would know the travelling conditions in advance. Plus I have not found wifi on board in more than one occasion. In 2019 wifi is a very basic service everyone expects to find for such a long journey.