Hi I found a James Blenkinsop who lived in London.
Born 1832in Carlisle, James was living in 1851 with his Grandfather William who was a partner in a Cotton Manufacturing Cmpany called Bleckinsop Johnston and Co. in Cumbria.
James married an Elizabeth Lye in 1853 in St Saviours Church Upper Chelsea.
In 1871 James (an engineer) was living with Elizabeth in Clerkenwell. That same year Elizabeth went into the workhouse in City road on 26th June for one month and then discharged herself.
In 1881 James (engineer) was alone in a lodging house in Saffron Hill. (married)
James Blenkinsop 19 Oct 1888 to 19 Oct 1888 Holborn (Sent To Highgate)
James Blenkinsop 10 May 1889 to 23 May 1889 Holborn (Sent to Mitcham Workhouse)
1891 He is in Cleveland St Asylum
He died in 1893 in St Pancras
This was the only James Blenkinsop living in London that
I can find.