My situation:
I have two nationalities, one of them is visa free. I was on a tier 4 student visa (associated to the non-visa-free passport), which got canceled when I took an interuption of studies. I missed the email informing me that my residence permit(BRP) was canceled. So I tried to re-enter the UK with the BRP to visit some friends on the 7th of June. They stoped and questioned me, and I immediately switched the visa-free passport and stated that my purpose was to vist friend. They questioned me and gave a code 3 stamp, 6 months leave to enter. The IO told me that this is a warning, and I might get questioned if I attempt to re-enter the UK. I stayed in the UK for 1 week before I left.
Question:
Am I flagged in their system forever? To what extent will they record detail of this 'warning' and how will this be used against me in the future?
I plan to go to the UK for a week and visit my friends again in early august, if I try to enter with the visa free passport what are the chances that they refuse my entry?
If they refuse entry and place a ban on the visa free passport, does it affect the appliccation to the new student visa on the other passport?
I'm really worried, any help is appreciated. Thanks!