His birth index:

Name:                   Mother's Maiden Surname:
PARK, CECIL HAMILTON    RADCLIFFE                  <- - - Note lack of ‘Radclyffe’
GRO Reference: 1875  J Quarter in KENSINGTON  Volume 01A  Page 174
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Was with his widowed mother and 2 siblings at his grand father’s in 1881 census.

In 1891 he was a pupil aged 16 at St Andrews College, Bucklebury, Bradfield, Berkshire.

In 1901 he was not the Cecil Park aged 25, veterinary Surgeon and born in Lambeth, Surrey

Bit in 1901 he was at Red Cliff Villa, West Lulworth, Wareham, Dorset with his wife, son and stepdaughter:

First name(s)  Last name  Relationship  Marital status  Sex  Age  Birth year  Occupation  Birth place
Cecil Hamilton   Parke     Head           M  M  26  1875  Retired Tea Planter  London
Barbara D        Parke     Wife           M  F  28  1873  -                    Newcastle on Tyne,
                                                                                 Northumberland
Cecil W A        Parke     Son            -  M 11mo 1900  -                    Wool, Dorset
M Violet         Bergholz  Step Daughter  -  F   4  1897  -                    Ceylon, Newara Elija
Emma M           Miller    Servant        -  F  12  1889  General Serv         Hazelbury Bryan, Dorset
Elizabeth M      Pickford  Servant        S  F  26  1875  Nurse                Somerset, Chilthorne
Minnie B         Dorey     Servant        S  F  22  1879  Cook                 Dorset, Fossel

Ref:
Archive reference  RG13
Piece number       1988
Folio              75
Page               12
Combined:          1891 ref: RG19, piece 1988, folio 75, p. 12
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In 1911 he was a tea planter from Ceylon, married with one son and living at West Mt Cottage Ashley Ringwood, Hampshire. She is sated to have had three children in this marriage of which only 1 was living:

First name(s)  Last name  Relationship  Marital status  Sex  Age  Birth year  Occupation  Birth place
Cecil Hamilton           Park      Head      M  M  36  1875  Tea Planter Ceylon  London S Kensington
Dolores Barbara          Park      Wife      M  F  39  1872  -                   Newcastle on Tyne
Cecil Walgrove Atherton  Park      Son      -  M  11  1900  School              Wool Dorset
Marie Violet             Bergholm  Stepdaur  -  F  14  1897  School              Newara Eliya Ceylon

1911 ref: RG14PN5892 RG78PN268 RD96 SD1 ED11 SN118

On the census form they also stated that they had been married for 12 years.  This marriage cannot be found in English records.  Two years prior to the marriage Dolores had given birth to daughter Maria Violet who was born in Ceylon.  So my guess is that she rapidly re-married, to Cecil, and in Ceylon.  It is even possible that her marriage to Bergholm will be found in this country.
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In 4 Oct 1895 he was on a boat, Ophir, to Colombo or EI (East Indies), and described himself as a gentleman.

On 16 Aug 1924, a Mr C.H.Park, photographer, aged 45 with his wife aged 47 were travelling to Freemantle, Australia on board the ship Osterley.  That would make him born in 1879 and her in 1877.  Not sure if this was him.
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The Coonwealth War Grave Commission has this on him:

PRIVATE:                    CECIL HAMILTON PARK
Service Number:             7288
Regiment & Unit/Ship:       Australian Infantry, A.I.F.  21st Bn.
Date of Death:              Died 24 September 1917
Age                         42 years old
Buried or commemorated at:  YPRES (MENIN GATE) MEMORIAL
                            Panel 7 - 17 - 23 - 25 - 27 - 29 - 31.
                            Belgium
Country of Service:         Australian      
Additional Info:            Son of Cecil Wallgrave Park and Mary Park;
                            husband of Dolores Barbara Park, of Barkly St., Sunbury, Victoria.
                            Native of South Kensington, London, England.
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