Megabus also have a presence in the UK, although their coaches (buses) usually leave from the same places as any other company's, often a coach station, and pic

Megabus also have a presence in the UK, although their coaches (buses) usually leave from the same places as any other company's, often a coach station, and picking up at normal bus/coach stops. What they also do, though, is partner with other non-discount companies, so if you get a ticket from Megabus (and their biggest selling point is that you can get fares from as low as £1), there's a reasonable chance that you won't actually be on a Megabus vehicle, they will have just sold off another company's seat that would otherwise have gone un-sold. (Megabus is actually owned by Stagecoach, a UK company with some presence in the States, and the fact that Stagecoach is one of the biggest travel operators in the UK obviously helps them, as Stagecoach will often by the company Megabus customers travel with when there weren't enough tickets sold to justify a Megabus vehicle.)