Sorry I haven't replied recently, I have been a bit busy with work. Thanks for the advice. It turns out that I won't be camping in Cornwall anymore, but I will still be cycling there.
My main problem at the moment is the route. Does anyone know of a good way to plan this sort of trip? I want to use the National Cycle Network (NCN) as much as possible, but I can't find a national overview map. My only map of the whole country is a road map. Also, more specifically, I want to cycle down the West Coast of England, but not Scotland. Is there a way to go down through the Lake District, while avoiding the West of Scotland. There seems to be a NCN route down the middle of the Scottish Borders, but it starts in Carstairs and doesn't link up to any of the other Scottish routes north of it.