For starters Just looking at my Gloucestershire CD's - the baptisms start from 1813

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Not sure if this helps....

Looking at the Burial Index - there is a

William Seymour COLCHESTER, died age 30 - 29 December 1843 at Gloucester (seems to have left a Will according to the Gloucestershire Records Office - occupation: Hatter - 1844/146)

and a

William Seymour COLCHESTER, died age 7w - 3 April 1845 - St James Glos. 2 Victoria Street - Looking at Gloucestershirebdm - mother's maiden name: FRISBY - South Hamlet, Gloucestershire.

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On Ancestry - UK Poll Books & Electoral Register 1811

Ashleworth

Seymour COLCHESTER, House & Lands - Looking at the Church of Latter Day Saints, his father was Stephen COLCHESTER