Hello,
I am aware that this thread is three years old, but I thought if anyone is interested I could shed some light on this.
Barbara ‘Bar’ Holland was my great aunt, who I only knew as a child but I did personally know her. According to my mum, who knew her well, she indeed never married. Lambton was in fact a family name which acted as a middle name, which is very common in my family. My grandmother, Bar’s sister, was Sheila Elizabeth Lambton Holland. Incidentally ‘Holland’ is my middle name. I’m not sure why the name ‘Lambton’ appeared only in 1939, she was born with that name. The most likely case is that it was merely a clerical error.
I only just stumbled across this thread and hope this info helps. Am happy to answer any questions, although I can’t guarantee I will know the answers, but will gladly share what I know of Aunty Bar.