Thanks, Peter and Nibbs.
I'll check out that site, Peter.
Nibbs, I have a fourth cousin, Robbie, in Shetland (ie our common ancestors are Thomas Winstanley and Margaret Sturdy) and the couple you mention are his great-great-grandparents. (Charles Blackburn was born in Southwark on 22 Mar 1843.)
Robbie provided me with this additional information on their children, all born in Liverpool -
George J Blackburn, born 23 July 1867, married Harriet Garner
Amelia Blackburn, born 26 Sept 1870, married James Tolond
Charles Blackburn, born 23 March 1869, married Margaret Ann Worthington, 26 December 1888
Frances B Blackburn, born 10 June 1872
Thomas Blackburn, born 19 December 1873
James Blackburn, born 25 February 1876
Joseph Blackburn, born 18 Nov 1878, married Edith Brown
He also sent me some family pictures from that time but I'm blowed if I can work out how to post them!!