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Thanks for that. It's possible that the TRE and RAE co-operated on automatic astro. What is mystifying though is the lack of mention of the RAE work by the TRE -  the only reference  I can find is in October 1948:  "RAE are developing a two-dimensional sighting head for flight experiments with the vertical seeking system. TRE are assisting in this work". It's almost as if there were two separate programmes.