I am an EU citizen. Seven years ago, I worked in the United Kingdom for six months. The work was given to me through an agency and the contract specifically said that I wish to work there only for six months (I wanted to get back to my country after that and enroll into an university). After arriving there, I opened up a bank account and visited job centre for an interview in order to obtain a National insurance number (NIN). Everything went smoothly and I got the NIN so I paid my taxes correctly during my employment. After almost six months at work, i.e. just before leaving the employer, I closed my bank account and the employer got me the P45 form. As I understand it, the employer is obligated to send a part of this P45 form to a British financial bureau to let them know. After that I left the UK and moved back to my country, where I started to study at an university, as planned. After some time at home, I applied for the tax return and the money were sent to me without any problems. So everything seemed fine.
My question is this. Should have I told some kind of British office (like the job centre or some financial bureau) before I quit the job and left the UK that I am finishing the job and moving back to my country? I have no reason to believe that anything is wrong - no bureau, nor the employer or the agency has ever contacted me in all these seven years although all forms had my permanent address in my home country. Plus, I already visited the UK like five times since and was never approached on an airport if something would be wrong with me in their database. But for some reason I got affraid recently if I am not still on the list somewhere as a person who did not tell anyone about leaving the UK and if maybe some bureau has me on a list as a person who quit his job in th UK, does not work now in the UK and owes some taxes because of it.
I would like to also mention that after finishing the job I (of course) did not apply for job seeker´s allowence nor any other form of support. I just left for my home country and started to study at an university.
Am I just paranoid and should forget about it, since I am sure the employer let knew the financial bureau correctly by sending them the P45 form? Thank you.