Sorry for the delay. We're just getting back into the swing of things.
We got the birth certificate and it definitely is "Ethel May".

Name: Ethel May Lamb
Born: 18 August 1885
Parents: James Lamb (cab driver) and Annie Bowen
Address: 19 Morris Road, Bromley
Registration District: Poplar (sub-district of Bromley in the county of Middlesex)
The birth wasn't registered until 25 September 1885. Is that unusual? It seems very late to us.
We are pretty sure that this all fits, so we're going to plough on. There was a mysterious "Flo" connected to Ethel May. This could be the Florence listed below. We're going to find her on the 1901 census next, as well as finding a marriage for James Lamb and Annie Bowen.
We also got Annie Lamb's death certificate. She died in 1894. It looks like James re-married, so the 1901 entry below with James Lamb and his wife Emma is now perfectly plausible. Presumably the young Edith shown on the 1901 census was Emma's daughter. We want to find out about her, too.
We also want to find James Lamb on the 1871 census. He'd have been about 16, so we should get the names of his parents.
It's going to be a busy night by the looks of it!
Thank you all so much for your help. You're stars.
