Reference to Porton Down, --- at University we had a trip to the biological research section. They assured us that they do no biological military work. One room we visited about the size of a small classroom, had hundreds (thousands?) of little brown packets on shelves and completely covering all four walls. These, we were informed, were packets of freeze dried human faeces for use in a long term research project into bowel cancer. When the participants died, their excrement from many years earlier would be examined to establish their diet and the state of their bowels. Another room was almost empty except for a table all by itself in the middle upon which was a glowing green bioreactor bubbling away. This we were told was a growing culture of gonorrhoea !! The reason for the wide space around the bioreactor was so that there could be safe movement in the room without the risk of knocking the bioreactor over. The building, built in WW2 was fascinating with corridors 4 meters or more wide. The original purpose of the building was to develop biological warfare and counter measures. The wide corridors were to allow safe movement of trolleys, with nasty substance carried on them, to pass each other with little chance of them bumping into each other. All corners and skirting were curved to facilitate easy washing of the corridors in case of a spill. Of course, now that we have mentioned Porton Down, this string will be picked up by GCHQ!