The hospital featured in Carry On Doctor was Maidenhead Town Hall, St Ives Road, Berks.  This has proven an extremely popular location for the Carry Ons and also showed up in Carry On Again Doctor and Carry On Behind. (Google Earth)

In the early 1990s, the local council had planned on demolishing the building but local residents launched a successful campaign to save the historic venue.

The nurses' residence was, in reality, opposite the Royal Lancaster Hotel, opposite Hyde Park in London (Google Earth)