Hello,
the birth certificate would tell you what 'B' stands ... but you already know that
There is a tree on Anc which has her father as George Castledine b 1881and I notice you have that name in your interests and again, you will know that Amelia married him.
So, I suppose I'm telling you nothing that you don't already know... sorry
Unless the father is published on the birth certificate though, it will be difficult.
best wishes
heywood
