and one boy chose to write about plumbing  and do you know, he found that there was nothing written down about plumbing  in the early nineteen seventies  there were one or two plumbing text books, they were very expensive and you could only get them through The Institute of Plumbers  plumbing is something that until about nineteen seventy five  was passed from father to son or uncle to nephew  it was a sort of secret craft  you know, you can 