I thought this was untrue so I checked. On UK Netflix there are at least 5 missing episodes and there's no indication they're missing. They're unavailable to purchase on iTunes too (although unlike Netflix, it numbers the episodes correctly so it's clear there are missing episodes). Appalling. I didn't think I would ever return to physical media for video content but...this is making me seriously consider it.
Edit: As an example of why this stuff shouldn't be censored, I'll explain my recent experience with NYPD Blue. The full thing (uncensored, I think) is available on Disney+. In the first few seasons, I was horrified at the racism. But, it served as an illustration of something that was shown on primetime TV in a specific time period. Personally I wouldn't have thought this type of content would have been broadcast in the early 90's and it was a good reminder of how far we've come. It's the same when watching old British comedies. There are lots of jokes that serve as a good reminder that things have changed for the better, even if it doesn't always feel like that. We shouldn't be erasing history.