Thank you Konsog for your reply.

I wonder if anyone was in similar situation (PR acquired deemed date in the letter dated back earlier than expected) and applied for the citizenship and whether they had their application rejected because of this.

Hi, I've got a question regarding my permanent residence status dates. I moved to UK from Poland in 2011 at the age of 2 months before my 16 birthday. My mum moved here in 2010. I went to college (course started just after I turned 16). I spent the next 4 years in college and then 2 years at uni. I ...