Hi,
I found the birth registration I was after. It is registered as Arthur Thomas
Lucas, and the birthday is absolutely correct (5th Dec 1855).
There is no father listed, hence the surname is the mother's maiden name.
So it has all been tied up. There are a few lingering questions, i.e. how did she fall pregnant.
She was living at 7 Gloucester Street,
Stepney. I don't know much about this property, but it is likely she is a lodger, as the 1851 and 1861 show her with family or married.
I wonder who the father is, and what happened to her in those 10 years!?