But did it work?
Went to see number one son in Durham. Left him a little present which I bought yesterday. It is a little box around the size of a matchbox. You switch it on and leave it in the victim's room. When the light goes out it makes a noise like a mosquito. When the light comes back on again it stops. I've hidden it just out of sight. I wonder if he's found it yet?
Of course, if he read my blog he'd be on to it already. But he doesn't, so I reckon he is fair game.