[Halcyon]

Alan, Do you have any concept of the price of petrol, price of train/ferry crossings, or have actually ever travelled on these modes of transport to realise they take a lot of time.
Time is money and if you can do a journey without eating or sleeping so dont need a hotel then you must honestly be a machine.
It is dangerous to drive without a proper nights sleep or not eating.

You then talk about hitch hiking. Unless you are with friends, who in this modern world do you think is going to stop to pick you up by the side of the road?
There have been enough cases of people being assaulted or whatever else to know that people dont just pick up passengers any more.

You may be able to walk from Dover to Scottland and yes it is feasible but would you do it? Would you not spend any money on food or stop for rest and a nights sleep?
YES you would.

It is simple: You can travel further by plane at a much cheaper cost.
And I will feel a lot safer travelling Ryanair than in the back of someones car that I don't even know.