Sir – Having been an avid reader of the Dave McManus column Times Tech for many years I feel compelled to make the following observations.

First he has not aged one jot over the years. Secondly, and somewhat alarmingly, he has green hair. I wonder if this is a fashion statement or an inevitable consequence of too many hours in front of a computer screen.

If the latter we may conclude that over indulgence in computing may be the elixir of life but at the expense of a splendid mop of green hair. Youth be warned.

Stuart Heath
Director, Beorn Designs
Oxford