There's a death in Chelsea district for George E Blake, aged 21.
Is this him?
No other George Blake deaths in London/Surrey in 1943.
Must be him, because:
Marriages, September qtr 1942
Wandsworth district vol 1d, page 1011
Blake, George E
Hart, Vera L
And probable birth:
March qtr 1922
Richmond, Surrey district vol 2a, page 936
Blake, George E Mother's Maiden Name - Perkins