The BBC has removed this episode from the series due to the recent increased racism awareness.
More info:
https://www.news.com.au/entertainment/tv/flashback/fawlty-towers-dont-mention-the-war-episode-removed-from-bbcowned-uktv/news-story/0c87f1f248940c24c77ada18d0081bf0
Seriously ! the show was like 10 something episodes why would they target a single episode like that and why in the world people are becoming overly sensitive towards things that happened ages ago.
Yes there was a WW2 that happened because "Germany" which was ruled by the "Nationalist Socialist Party" aka Nazi's invaded neighboring European countries and yes WWI happened because a royal figure was assassinated and the royals in Europe decided to play War with each other to avenge and at the same time acquire more land to add to their properties while killing millions of innocents across Europe.
This is not in anyway a racism awareness ? they really want to erase history to what they like...this is stupidity.