Thank you m p griffiths and Slowhands.

I have found the last entry in a UK census for Unsworth Rothwell was in 1891 Hackney, London, and a Nellie M Bryant in Marylebone in the same year.

If her parent's were James and Emilie Bryant, perhaps Helena decided to take the plunge after her mother died in 1911.

I still cannot find a connection that would make Helena a niece of Arthur Bryant though.

MJL