I think ‘The Germans’ provides the definitive answer, when Polly asserts that she is only there at meal times (when discussing fire drill arrangements) (as Robot Arm has pointed out). I think it is given that Polly has an outside life and only works at FT, rather than actually being resident. It’s perfectly possible that at times she uses an unoccupied room for some temporary reason, without it actually being where she lives.
I take exception to Ostragoth’s parting comment. Lost is just a TV show. Fawlty Towers is very much a real place, and a venerated, sacred one at that. It exists in the reality of the British way of life, and the British hotel trade in particular. If you wish to believe it’s fiction, that is your (erroneous) right, but it suggests you’ve never actually spent some time in a regional British hotel. I’m British, and I have, and believe me, FT is, if anything, an understatement of the awfulness of service one can experience on a depressingly regular basis.
Case in point, I recently stayed in a hotel in Blackpool. I had specifically asked for a room on the side of the hotel away from the street and traffic noise. This had been confirmed TWICE before I got there. Lo and behold, when I got there my room was on the street side of the hotel, and all the traffic noise came right in through the window. The hotel owner, when asked about this, merely observed that she thought she had got things a bit muddled up. And smiled about it.
The room was the smallest hotel room I have ever stayed in, anywhere in the world. Smaller even than hotel rooms in Japan, which are very small indeed.
When I arrived, the owner explained that for some reason the heating in my room had temporarily stopped working, but it wasn’t a problem as she had put a portable, temporary heater in there. Just what I needed: something to take up more of the room I didn’t have. Swapping notes later with another hotel ‘resident’, this turned out to be a tissue of lies. The heating didn’t work in ANY of the rooms, and hadn’t for years, and they ALL had little portable room heaters in them.
There was no cold water supply in my room. Turn the tap, nothing. When I asked the owner about this, she paused for a while, stared at me with a sweet but vacant smile, and then asked me if I was saying I wanted her to do something about it. Her tone made it sound as if I had requested some outlandishly fanciful luxury item. I said yes, please, I would, and so eventually it was put right.
And so on. Fiction? I assure you, Sir, that Fawlty Towers is very much a documentary series, and the passing of the years has not diminished its relevance or accuracy one iota.