This Certificate was given to my great grandfather Christopher Dye when he left the Training Ship "Formidable" off Portishead, Bristol. He was there between 1882 and 1885, from age 13 to 16.
The school was started in December 1869 to train 350 street children (boys) of Bristol (referred to as "street Arabs"), and was paid for by Bristol businessmen. Christopher came from Norwich, and we do not know how he arrived in Bristol.
There were other training ships in various locations in the UK - at least three were a kind of borstal. Formidable was classed as an Industrial School. Not all boys joined the Merchant or Royal Navy. Christopher subsequently worked in Norwich as a plumber with his father.