His birth registration:

Surname   First name(s)      District   Vol  Page
Births Sep 1880   (>99%)
AVEY Reginald Cecil    Newmarket 3b 551
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Note that his forenames were then given to a first cousin a year later.
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In the 1911 census this was his family:

Surname  Forename  Age  Gender  Relation  Marriage Status
Years Married  Occupation  Birth Place

Avey Reginald 30 Male Head Married 4 Policeman Chippenham, Cambridgeshire
Avey Alice 30 Female Wife Married 4 Chippenham, Cambridgeshire
Avey Gwendoline 3 Female Daughter Single - Bury St Eds, Suffolk
Avey Annie 1 Female Daughter Single - Horringer, Suffolk

Reference: RG14 - PN10611 RD207 SD1 ED12 SN106

Address: Horringer, Bury St Edmunds
Registration District: Bury St Edmunds
Sub District: Rougham
Civil Parish: Horningsheath
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The marriage indices look like giving him three marriages:

Surname   First name(s)      District   Vol  Page
Marriages Sep 1906   (>99%)
Avey Reginald Cecil Newmarket 3b 1155
Surname   First name(s)   Spouse   District  Vol  Page
Marriages Mar 1935   (>99%)
Avey Reginald C Farmer Hatfield 3a 1417
Marriages Sep 1947   (>99%)
Avey Reginald C Johnson Sudbury 4b 2913
Avey Reginald C Parker Sudbury 4b 2913

or might some of this be of a son with the same forenames?
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And this birth indicates that his first marriage produced a son of the same names:

Surname   First name(s)   Mother   District  Vol  Page
Births Jun 1915   (>99%)
Avey Reginald C Vyse Chesterton 3b 710

However the Vyse mother was involved in another marriage:

Surname   First name(s)      District   Vol  Page
Marriages Sep 1898   (>99%)
Avey Harry Camberwell 1d 1539
Vyse Florence Annie    Camberwell 1d 1539

So the other Reginald Cecil was NOT a close relation.

His father Harry was born in Wicken Cambs in 1878 and his mother Florence Anniie nee Vyse was born in Hatfield herts in 1880.  In 1911 they had four children, ages 8, 6, 4, and 1.

Harry was found in the 1881 census with his mother Susan and three elder siblings.  Susand was a wider.  Harry was recorded then as born in Ashley, Cambs.

In the 1871 census Susan was married to Edward Avey and they already had 5 children, of whom the first three had moved on or died by 1881.  Guessing from the eldest daughter’s then age of 10, Susan and Edward married around 1860.  But there is no marriage of an Edward Avey from 1855 to 1863.  And Edward cannot be clearly identified in the 1861 census.  So the realtionship between the two sets of Reginald Cecil Aveys cannot be determined.
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Reginald and Alice nee Plaice had no more children after the 1911 census, or rather no more were found on FreeBMD.
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His death registration date:

Name Reginald C Avey
District Bury St Edmunds, Suffolk
Date of Birth 88 yrs
Page 1297
Volume 4D
Registered January - March 1969
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Their marriage registration date:

Surname   First name(s)      District   Vol  Page
Marriages Sep 1906   (>99%)
Avey Reginald Cecil Newmarket 3b 1155
PLAICE Alice Maud    Newmarket 3b 1155
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