Roger, if you are worried by the actions of morons who won't read instructions even when they are in VERY BIG EASY TO READ LETTERS, try the following mental exercise.

Take a deep breath, and close your eyes.

Picture yourself by a gently flowing stream, Birds are singing in the crisp mountain air, Nothing can bother you, The soothing sound of the gentle wind fills the air with serenity, The water is crystal clear, You can easily make out the face of the idiot whose head you are holding under the water.

And Phillipa please don't encourage them by adding to the blasted thread!

Pete M (OI)