It looks as though his birth was registered as Edward Harry Symonds (not Henry), which might help the Registry find his death cert if you have already tried there? www.gov.im/registries/general/civilregistry/
See under Contacts to email them.

He is in the 1881 census aged 3 months, and in FreeBMD in Births Mar quarter 1881:
Surname First name(s) District Vol Page
SYMONDS Edward Harry Chorlton 8c 793
Also:
Births Jun quarter 1879:
Surname First name(s) District Vol Page
SYMONDS Erasmus William K Chorlton 8c 730
- who was with him in the census.

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