The first of three Berkeleys built to meet an RAF requirement for a day and night bomber. The Hawker Horsley emerged the winner. The three Bristols were taken on charge by the RAF for use in experiments by the Royal Aircraft Establishment at Farnborough. At least one survived until 1930. The Berkeley was the first Bristol aircraft to be built with a model number. 90 was arrived at by counting back over past designs. Photo from: Imperial War Museums