Well, speaking as that guy from Northern, I'm well aware of the cascade.
But obviously a) that's not really selling it very well, b) far too complicated to explain in a short interview and not particularly engaging for the audience, and c) we don't even know the exact details of what will be cascaded where yet so it would've been pointless rambling on about it. As it is, the interview got edited down a fair bit because I said some really uninteresting things. There lies the difference between someone who's really good in front of a camera and someone who isn't - it's much harder than it looks.
All credit to Geoff and Vicki - I'm amazed they are able to continue to summon up that level of both enthusiasm for their journey and patience for the people (and trains) they're dealing with after over 2 months travelling with another month to go. They are lovely, genuine people. I had arranged to meet them for the Stockport-Stalybridge journey but some other enthusiasts cottoned on and turned up on the train of their own accord, in addition to the Friends of Reddish South, the woman they interviewed at Stalybridge, and someone who knew Geoff - we basically had a carriage full of people who had turned up to meet them. I don't think I could have dealt with them as well as they did. If that's the sort of thing they are having to deal with on a regular basis (especially when it comes to the parliamentary services), they are doing an incredible job.