Interesting thread. Can't help with when Audrey returned to the UK, however a couple of newspaper items that may be of interest:
I don't think it has been mentioned that the child of Adrian and Ruth GARDNER born 1942 only lived for 2 days.
"GARDNER - On July 27, 1942, at "Piersfield", 102, Manor Road, Wallington, Surrey, to RUTH (nee Pothecary), wife of ADRIAN GARDNER, The Cameronians (Scottish Rifles) - a daughter (ELIZABETH ANN), who only survived two days."
Friday, July 31, 1942
Publication: The Times
Also an adventure for 18 year old Adrian when a cadet with the Tonbridge School when he and 2 others were taken up in a balloon which became untethered and drifted some 50 miles. A long article here:
Saturday, Aug. 6, 1932
Publication: Bath Chronicle and Weekly Gazette