Mark
See
http://www.nationalarchives.gov.uk/r...cord-books.htm
put in 74 and then 1941 for both years and Robert is your Mothers Brother
See
AIR 27/641/7 01 April 1941 - 30 April 1941 Summary of Events
AIR 27/641/8 01 April 1941 - 30 April 1941 Record of Events
AIR 27/641/9 01 May 1941 - 31 May 1941 Summary of Events
AIR 27/641/10 01 May 1941 - 31 May 1941 Record of Events
All 4 will cost you 4 * £3.36 = £13.44
Probably pay that in fuel/fares and sandwiches!