that helps

Halstead Essex is not far from Colchester - a major Garrison town ( almost certain to have India links)

then this opens up

First name(s) William Mervyn
Father's last name Ellis
Last name Ellis
Father's first name(s) Herbert
Mother's first name(s) Hilda May
Birth year 1914
Archive reference N-1-400
Birth date 12 Dec 1914
Folio 32
Baptism year 1914
Catalogue description Parish register transcripts from the Presidency of Bengal
Baptism date 28 Dec 1914
Record set British India Office Births & Baptisms
Place Cawnpore,All Souls
Category Birth, Marriage, Death & Parish Records
Presidency Bengal
Subcategory Parish Baptisms
Country India
Collections from Great Britain, UK None

First name(s) Hilda May
Country India
Last name Ellis
Archive The British Library
Birth year 1895
Archive reference N-1-461
Age 27
Page 324
Death year 1922
Catalogue description Parish register transcripts from the Presidency of Bengal, : 1713-1948
Death date 25 Jun 1922
Record set British India Office Deaths & Burials
Year 1922
Category Birth, Marriage, Death & Parish Records
Burial date 26 Jun 1922
Subcategory Parish Burials
Place Meerut
Collections from Great Britain, UK None

Hilda May McCurley Marriage to: Clarence Fitzherbert Ellis
June 7 1913 Bareilly, Bengal, India

First name(s) Clarence Fitzherbert
Groom's father's last name Ellis
Last name Ellis
Bride's father's first name(s) Theo
Marriage year 1913
Bride's father's last name McCurley
Marriage date 7 Jun 1913
Catalogue description Parish register transcripts from the Presidency of Bengal, : 1713-1948
Spouse's first name(s) Hilda May
Archive reference N-1-389
Spouse's last name McCurley
Folio number 29
Place Bareilly
Entry number 1
Presidency Bengal
Record set British India Office Marriages
Country India
Category Birth, Marriage, Death & Parish Records
Groom's age 30
Subcategory Parish Marriages
Bride's age 19
Collections from Great Britain, UK None
Groom's father's first name(s) John A S

Name Clarence Fitzherbert Ellis
Birth 1883 Bengal, India
Death 1974

Clarence Fitz Herbert Ellis was with the 7Th Hussars in Meerut India and discharged in 1916 Private ( Temp Sergeant) of good character and a Civil Engineer