It is usually about ten weeks for early booking, but if there is any works on the line, I think they can hold back for a while longer. This tends to feel like they are trying to stop you doing the ride and are out to get you personally. I don't think they are, i think it isn't always easy to manage a rail network.
I struggled and worried about it all last year trying to sort it all out over the internet and phone (going from Nottm.). In the end I went to speak to a person at a train station, got a really good service, the man was happy to go through various options . Just don't go in at peak time if you're going to be there a while. I think it only cost about 20 quid in the end and about 35 back from JOG....after reading horror stories about getting back from JOG it turned out to be quite easy, I just had to be a little flexible and add a day on...but then that gave me an extra day, so didn't really matter.
I struggled and worried about it all last year trying to sort it all out over the internet and phone (going from Nottm.). In the end I went to speak to a person at a train station, got a really good service, the man was happy to go through various options . Just don't go in at peak time if you're going to be there a while. I think it only cost about 20 quid in the end and about 35 back from JOG....after reading horror stories about getting back from JOG it turned out to be quite easy, I just had to be a little flexible and add a day on...but then that gave me an extra day, so didn't really matter.