Imperial Airways Nav Aids
I was listening to a radio programme earlier today and as part of a query section someone asked about a 'Lamp Room' that he'd seen in the tallest lying house in a village near Orpington where apparently Imperial Airways had installed Nav lights back in the day to aid the aircraft coming in and out of Croydon Airport. There were no lights or equipment when the person visited the property. The question was also posed if there were other such Nav Lights etc at other points in London and it's surrounds. I'm assuming that this would have been pre-WW2. I thought some of the great minds that contribute to AH&N might know some answers.