I couldn't really afford to do that for too much longer. I enjoyed putting it back on though. It's important to keep a close eye on your expenses. As I have already said, it's going to cost you a lot. Multiply those figures by 10 weeks and there is quite a difference.
Food takes another chunk from the budget.
You can't do anything about buying maps, unless you can borrow them from someone. Don't forget phone calls, postage for things to send home, and then postcards and stamps. On the subject of money, it's no good having a Swiss bank account full of gold, if you have run out of the readies on your wallet. Depending on your route, you may not see any bank for a week or more, let alone a bank that will take your cash card. This is particularly important in Scotland, but also along the Pennines.