Go back ten years and even more stations were open for Battle of Britain "At Home" days. According to a report in The Times in September 1953:
In 1953 more than a million people visited 70 RAF airfields for their Battle of Britain "At Home" days. The total reached 1,149,800 compared with last year's record of 966,000. The biggest crowd was at Biggin Hill, Kent, where there were 160,000 spectators