Theme parks, the seaside, cinema - you name the obvious ways to entertain children over the school summer holidays, and most involve parents putting their hands into very deep pockets.Indeed, new research has found that families spend an average of £440 per year on days out, and two thirds say the high cost of activities simply stops them from going.That means having to think of something cheaper and more imaginative to head off the calls of "I'm bored!" - and as a result, a...
