In the 1939 register, my ancestor Kathleen Meehan is shown as living with her parents in Darlington. The entry also shows her later married name of Phipps. However, to the left of her name, in the column where the schedule number is, is (the date?) 13 8 42 and below that the letters XJDM. It looks as if the M may have been written in a different hand to the other letters.
My question is, what are these dates and letters likely to mean?