Quixote, thank heavens for people like you. Even though I knew the 'toguh' nut might not be known to all Forum members, I couldn't be bothered providing all the background information. It was great that you were able to give such a detailed report, and I'm sure many people heaved a huge sigh of relief at having to do no research themselves.
PS The 'specialist subject' round on Mastermind could be a good way for you to get on to television - the opportunity to address a wider audience might appeal?