The definition of 6 months in the UK entry stamp [duplicate]

I am a Brazilian citizen currently working in a university in the Netherlands. Me and my girlfriend, who is British had a 20 day trip planned back in April. As I came to visit her (for us to go together), our flight was cancelled due to the covid-19 crisis. Moreover, my flight back to the Netherlands was also cancelled, therefore I was not able to leave the UK on the date I planned. I have been doing home office from her house since, now that things seem to be going back to normal, I want to book my flight back to the Netherlands, however, if possible, I would like to avoid for a bit longer to enter in a plane as corona is still a risk.

In the stamp they put on my passport when I arrived it says I can stay for 6 months. I never had to worry about this definition before now, however, how does the 6 months limit work?

Are the 6 months renewed every time I come in? Which I find very unlikely, as I mean, seems far too easy to exploit.
Are the 6 months renewed on a calendar year basis?
Are the 6 months renewed on a 12 month rolling basis?
Something else?

I specifically remember that, a couple years ago, a immigration officer at passport control telling me option 2 was the correct. I wanted to confirm this information now, so I called both covid-19 helpline for immigration, and the "general immigration advice" at 0300 123 2241, however, they told me the correct option was 1.

The email I found for immigration queries specific for covid-19 specific did not answer this question, as is not directly related to covid. But I did not manage to find a general email for immigration queries, does anyone know one?

I would be okay with that if I had managed to have it written, but I am worried whether this was just a bad luck of having two officers who did not have the right information. What if later this year I come back to visit her and another officer at passport control also claims option 2 is correct, I would not be able to use the calls as proof that I got the information from an official source.

Should I just assume a worst case scenario and go back as soon as possible?

visas uk overstaying

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Can I enter UK after 6 months?

You can visit the UK as a Standard Visitor for tourism, business, study (courses up to 6 months) and other permitted activities. You can usually stay in the UK for up to 6 months. You might be able to apply to stay for longer in certain circumstances, for example to get medical treatment.

What happens if I stay in the UK longer than 6 months?

You may be able to extend your stay as long as the total time you spend in the UK is no more than 6 months. You must meet the eligibility requirements and pay the \xa31000 fee. For example, if you have been in the UK for 3 months, you can apply to extend your stay for 3 more months.

What is entry stamp in passport?

The CBP admission stamp is issued at ports of entry upon arrival. The stamp is placed on a passport or travel document and notes the date of admission, class of admission and admitted until date.

What is immigration entry stamp?

A visa, or visa stamp, is a physical stamp or sticker in your passport that is issued by a U.S. embassy or consulate outside of the U.S. It indicates that you are eligible to apply for entry to the U.S. in a specific immigration category such as J-1 or H-1B scholar.

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