There was a fascinating article in the Sunday Times Supplement about 18 months ago where their reporter spent a day at GCHQ. Apparently over 60% of their employees are on the autistic spectrum. The reason being that these special people are generally of high intelligence, are extremely single minded and completely focused on their given tasks. They are brilliant code-breakers having numerical memories and rather like a dog with a bone will persevere with a problem till solved. The reporter found it strange that there was no chatting in corridors, by coffee machines, lifts, everybody just got on with their job. Thank goodness for these wonderful and differently able people who help keep our country safe.