I don't think it would be a terrible idea for them to offer some kind of package deal to be honest. Advertise something at the London Eye, Dungeons, Sea Life etc. Some kind of multi-attraction ticket with a shuttle bus from central London and back. I mean, they've got similar for Legoland Florida (different market I know). As people have said, nobody is going to London to visit a theme park, and most international tourists wouldn't even know that Thorpe Park is there, so despite being "easy" to get to via train, it won't even be on the radar. A lot will end up at the central London attractions though. Is Thorpe even advertised at those? Genuine question since I have no idea, but it would seem like a glaring omission if they don't at least have a few posters/leaflets around. Despite not being a priority, people will often find themselves with an extra day or two. I kind of see it like Park Asterix in a way. Nobody is going to Paris to visit Asterix, but they have bus/ticket combos from the city centre. I'm sure they get mostly locals using those, but they must grab a bit of tourist trade as well.