Hi Gill
One of my g.aunts died in Hull Workhouse aged 13 of Cardiac Dropsy, in October 1903. She was an orphan, her younger brother had been put into a children's home in Hull (but there is no record of her having gone there) and her older brothers went into the army, her older sisters lived locally, so I'm assuming it was the hospital where she died and not the workhouse as such. Indeed she was one of the witnesses at her eldest sister's wedding 5 months earlier, which makes me think she didn't live in the workhouse. Unfortunately there is no other info available as to where she lived after the 1901 census and prior to her death.
Her death certificate just states Hull Workhouse, her married sister was the informant but it doesn't state she was present at her death.
If you go to
www.hullcc.gov.uk/ then click on Family History on the left hand side of the home page, then go down the family history page, you will find a database called Photographs of Hull. On there are photos of the workhouse. I have bought copies of them, but copyright stops me putting them on here.
Lizzie