Hello again Mabel,
I am no longer as confident that Myrtle who dies in Lewes in 1958 - listed as Myrtle A Nutter is the person I am seeking but it could be her. Her age at death is 80 meaning a birth about 1878 and this fits with what we know.
Myrtle Amelia Sharp's birth was registered Sept 1878 at Midhurst and baptised by the vicar Henry Wood on 7 March 1880 Easebourne.
According to the 1939 Register, the Myrtle Nutter of Hammersmith Grove, Hammersmith birth was 20 Oct 1877. This really cannot be the Myrtle Amelia Sharp I am seeking as her birth was registered in Sept 1878 which is at odds with the possible Myrtle of Hammersmith who was born the following month.
Perhaps back to the drawing board?
Westy