Looking again at these pics, some of the mortar looks new and some areas are very 1970's/80's and filthy dusty so I am thinking this went out of use, was bought and improvements started on but then went back out of use. In places it has that kitsch quality of a seaside "attraction", themed inn or medieval banqueting place and that themed outdoor pool is pretty unsubtle so may be for kids but it also reminds me of a place where they let the seals come out for the tourists, especially with that window - maybe for tickets or ice creams? The aquariums, window pond and parrot cage tie in with this seaside attraction theory and the tables could have carried more tanks. There seems to be a bar or shop counter and possibly a cloakroom/reception booth or smaller serving hatch. Maybe they retired (or the price of pine went up and they went bust, lol) and then it was bought by someone who wanted to make it a bit more sophisticated but they went bust. /Sherlock Holmes mode off, lol.