Hospital is the unnamed hospital which features in The Demon Headmaster Strikes Again and is where Lloyd is sent after The Giant Wasp stings him outside the Biogenetic Research Centre.
It is situated most probably in a neighbouring town away from the village of Shellbrook where the Hunter's moved to in that series, seeing as it seems too small to have a hospital. Dr. Gill may work or definitely have associations with the Hospital.
SPLAT visited Lloyd at the hospital along with Mr.Hunter and Mrs.Hunter, only one ward is shown and a group of doctors and nurses seem to be around him all the time showing the seriousness of Lloyd's condition.
LLoyd being rushed into hospital after being stung.