Ray,
My Hamblyn's were from Lambeth and Southwark, but here are some more details, just in case it would help,
I am interested to find more on;
Marriage of John(Spence) Hamblyn to Catherine Anderson,
both born around 1800, married about 1835, St Marys, or St George the martyr,Lambeth.
Baptisms of the above John and Catherine?
         Baptism,John Hamblyn(son of John/Catherine, born 1835, baptised June 30 1837 at St Marys, Lambeth(according to  IGI)
         More on Baptism of John Hamblyn(son of William/Elizabeth) July 29 1860 St Sepulchre(according to IGI)
        Baptism,Henry Hamblyn 1862-1866(son of William/Elizabeth),Waterloo Road/Lambeth Church 2nd
        Baptism,Martha Hamblyn(dau of William/Elizabeth) around 1864,waterloo road/Lambeth Church 2nd
        Marriage,Martha Hamblyn to Unknown after 1881
      Baptism,Thomas William Hamblyn(son of William/Elizabeth) 1866, Waterloo road/Lambeth Church 2nd
      Baptism,George Hamblyn (son of William/Elizabeth) 1868,Waterloo Road/Lambeth Church 2nd
      Baptism,Alfred John Hamblyn 1871-1872,Waterloo Road/Lambeth Church 2nd
      Baptism, Thomas William Hamblyn(son of Thomas/Louisa) 1891,Lambeth Church 2nd
      Baptism, Albert Charles Hamblyn(son of Thomas/Louisa) 1895, Lambeth Church 2nd
I hope that something of this may throw up some more details, 
yours sincerely 
Paul