Critical or other comments, so long as they are genuine, are always welcome. Readers, please watch out for sploggers among the comments. They are people with small brains who spend their time wasting the time of others. In this case they have decided to waste yours by putting nothing at all in their comments except a link to sites that offer nothing of value to you. You can pick them by their silly names. I will delete these comments when I notice them. Just click on the ‘no comments’ or ‘comments’ link to leave your contribution. Sploggers, if you want to make a lot of money from the internet and think it would be great to attract links from sites like mine, and if you are so unintelligent and amoral as to be unable to understand what a nuisance your unprincipled greed is to me and my readers, just go away and think about the consequences to you if I ask the powers-that-be on the internet to track you down and ban you from the entire net. They can do that.