Should be asleep
So, Lewis (and a trope in general)...
Do these abandoned mansions that were childrens' homes / mental (or otherwise) hospitals which are abandoned and decaying and occasionally squatted exist in real life? Surely they get sold off for flats?
Also, the Old Golf Course standing in for Port Meadow.
[ETA - and oh what bad young actors, surely this isn't the best, or even the non-bottom three quartiles the country can offer].