You can find the alternatives how to get to England, including their advantages, disadvantages and other practicalities in the subsections of this chapter.
However, it is not true anymore that planes are the most expensive means of transport. If you spend enough time looking for the plane tickets, you can find one for less than 20 pounds, including the luggage. You can find instructions how to get a cheap ticket from the airport in the chapter dedicated to travelling by plane or you can ask me.