Kensington pub index
It is a named public house by 1944, whereas previously just a beer house. The 1879 license transfer does name it as the Portobell Stores.
A listing of historical London public houses, Taverns, Inns, Beer Houses and Hotels in Kensington, London.

Portobello Star, 171 Portobello Road, Westbourne Grove, W11
Kindly provided by Philip Carter
Residents at this address
1871/Alfred Thurston/Beer Retailer/61/Stradbrook, Suffolk/Census
1871/Susannah Thurston/Wife/64/Swiftling, Suffolk/Census
1871/Robert Hopkin Bobby/Son in Law, Builder/39/Denbyshire, Norfolk/Census
1871/Charlotte J Bobby/Daughter/33/Clerkenwell/Census
West London Observer. 05 July 1879 - Transfer of Licences
The Portobell Stores, Portobello road, Notting hill, Arthur Hendon Cole to William Grainger
1881/William Grainger/Beer Shop/55/Norfolk/Census
1881/Louisa Grainger/Wife/45/London, Middlesex/Census
1881/Rose Clark/Visitor/16/Stratford, Essex/Census
1881/William Grainger/Beer Retailer/../../Post Office Directory
1891/Charles Adolphus Wood/Beer Retailer/../../Post Office Directory
Paddington Times. 05 August 1898 - Transfer of Licenses
Portobello Star, Portobello Road, R D Williams to W Smith
1910/Henry John Griffin/Beer Retailer/../../Post Office Directory
1914/Albert Thomas Worland/Beer Retailer/../../Post Office Directory
1915/Albert Thomas Worland/Beer Retailer/../../Post Office Directory
1921/Albert Thomas Worland/Beer Retailer/../../Post Office Directory
1934/Albert Thomas Worland/Beer Retailer/../../Post Office Directory
1938/John Fisher/Beer Retailer/../../Post Office Directory
1944/David Blake/Portobello Star/../../Post Office Directory