Hi Simon There seem to have been a number of Bartlett families in London and S/E in the 19th century. As you will probably already have read, I am seeking info on my grandfather's family (he was born Leslie Frank Bartlett in July 1900, and was reputed to be a true cockney). Understand he had a sister Evelyn who married Ernest Cleaver in Northamptonshire. My grandfather married Joyce Thorneloe also in Northants.
Understand the family also consisted of two brothers who were in the navy (mil or merchant) as well as father and mother.
Understand that Leslie Frank Bartlett's mother had a sister (or similar) who lived at Deganwy in North Wales.