This is likely to be his registered death date, the only one in Newmarket over a 50 year period:

Surname First name(s) Age District Vol  Page
Deaths Sep 1922   (>99%)
Cooper Albert E 58 Newmarket 3b 442

But there are other Albert E Cooper deaths around the country.
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This is her most likely marriage, probably in London because she was already pregnant with Victor:

Surname First name(s) District Vol  Page
Marriages Sep 1895   (>99%)
Cooper Albert Edward Hackney 1b 1020
Livermore Ellen Mary Hackney 1b 1020
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