Staying more than 90 days with a U.K. Passport - Page 2

Thank you for the clarification..

Can anyone explain or recommend someone for advice on this 90/180 day restriction. I have researched and it is very confusing - it seems the 90 day allocation begins on the day of travel and is then counted from then ... for example i arrive on march 1st 2021 and my 180 day period starts then ... finishing on 1st October 2021 (6mths) ? So within that time i have 90 days (3mths) ? So After 1st October it starts again ? Please help as I was confronted by a very aggressive Passport Controller at Mahon Airport who was obviously confused by the amount of stamps i now carry in my passport - as i do many short trips! 

Where it gets slightly more complicated is the EU definition of ’90 days within any 180-day period’. Here, it’s best to think of the 180 days as a moveable timeframe rather than a fixed 180-day period. The 180 days are counted backwards from the date of arrival or departure from the Schengen area.

Each time you enter or leave Schengen area, a new 180-day period would be calculated from that date. You do not need to concern yourself about dates of previous arrivals and departures, only the total number of days spent within the zone during that particular 180-day period.

If you arrived in France from the UK on March 15th, it would be the 180 days before March 15th that would be taken into account. If you had already spent the whole months of November, December, and January in France (totalling 90 days) and hoped to return on March 15th, you would be refused entry.