Hi Ysabeau
William Alexander Yool married in 1856
Marriages Sep 1856
Emberson Henrietta Louisa Brighton 2b 255
Yool William Alexander Brighton 2b 255
and gives his place of birth on the 1861 census when aged 35 (in Kensington) as St George Hanover Square.
Deaths Dec 1883
YOOL William Alexander 57 Christchurch 2b 384
George Valentine Yool doesn't seem to have married.
Deaths Dec 1907
YOOL George Valentine 79 Kensington 1a 85
Again on censuses he gives his birthplace as Hanover Square.
Henry Yool aged 66 in Weybridge on the 1891 census gives his birthplace as St George Hanover Square.
A second marriage?
Marriages Sep 1874
Miller Mary Jane Chertsey 2a 61
Yool Henry Chertsey 2a 61
Deaths Dec 1894
Yool Henry 70 Chertsey 2a 24
Deaths Jun 1930
Yool Mary J 85 Chertsey 2a 92
The baptism registers for St George Hanover Square are not indexed on the IGI. The parish registers are held at Westminster Archives.
http://www.westminster.gov.uk/services/libraries/archives/1851 census HO107 1467 folio 144
51 Gloucester Road Paddington
William Yool 64 Head Married Coal Merchant Scotland
Anne Yool 52 Wife Married Scotland
Henry Yool 26 Son Coal merchant Conduit St
Wm Alex Yool 25 Son Coal merchant Conduit St
3 servants plus 1 visitor
Regards
Valda