This looks like his birth:
Surname First name(s) District Vol Page
Births Sep 1905
Denne Alan Ralph Eastry 2a 1121
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Harry <
spud0802@aol.com> reports that, from the 1911 census, Alan’s father was George Henry Denne born 1857 Deal, Kent; GRO Ref Is June 1857, Eastry, 2a, 609.
And:
Nellie Ralph Gardner was in the Dec quarter of 1890 I
presume at Deal, GRO Ref is Dec 1890, Eastry, 2a, 1773.
Nellie was born in Deal GRO Ref, Jun 1871, Eastry, 2a, 813.
There are 2 kids listed on the 1911 census
Evelyn Mary Denne aged 16 born in Deal.
Alan Ralph Denne aged 5 born in Deal.
Unfortunately neither he nor I can find them on earlier censuses, so it is not yet clear which families they came from.
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It is interesting that there were a fair few George H Denne births from 1840 to 1885:
Surname First name(s) District Vol Page
Births Jun 1857
Denne George Henry Eastry 2a 609
Births Jun 1866
Denne George H Bridge 2a 606
Births Dec 1867
Denne George Henry Thanet 2a 747
Births Sep 1877
DENNE George Honnor Medway 2a 510
Births Jun 1880
Denne George Henry Milton 2a 859
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In the London Gazette of 21 Dec 1944 he was listed for his MBE as a Captain, temporary Major, no 107359, with the Royal Army Service Corps.
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Here’s the family in 1911:
Name Relation Condition/ Yrs married Sex Age Birth Year Occupation Where Born
DENNE, George Henry Head Married M 54 1857 Builder And Contractor Kent Deal
DENNE, Nellie Ralph Wife Married 20 years F 40 1871 Kent Deal
DENNE, Evelyn Mary Daughter Single F 16 1895 Kent Deal
DENNE, Alan Ralph Son M 5 1906 Kent Deal
FINNIS, Edith Alice Servant Single F 23 1888 Cook Domestic Kent Deal
ROWE, Ada Servant Single F 20 1891 Housemaid Domestic Kent Woodnesborough Nr Sandwich
RG number: RG14 Piece: 4565 Reference: RG14PN4565 RG78PN191 RD64 SD4 ED2 SN8
Registration District: Eastry Sub District: Deal
EnumerationDistrict: 2 Parish: Deal
Address: Neville House Queen Street Deal
County: Kent
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No will found for him on the England Probate WWW site.