I am not certain of the year which George and Irene married, but my Nan said she believes it could be 1941 or 1942. They were married in India.
I am not sure of the date they came back to England either.
Irene was born in 1910. I don't know what year Isabella was born but I do know she was born before Irene.
Sadly, what we do know is very limited. I don't think we will ever know.