Is it possible TK could get the police involved in this again or attain any extra details about me?

Like mentioned in title I was caught shoplifting at TK Maxx. Long story short. The police was called and I was taken to their small room for a search. TK got all their stuff back. The police gave me a warning and I had to sign the paper saying that I am willing to give my personal details to the store so they can send me the letter from RLP. Their job ended there. I was told by the store manager to wait for the letter from RLP and so it came a few days ago. They want me to pay 270 pounds. In general Im not from UK. I am an exchange student going back home by the end of jan. In the paper (notice given by tk maxx) only my current uk address has been written down. They also have my full name and date of birth. My question is : What may happen if I just ignore the letter. Can Tk max obtain more details regarding my persona from the police in order to take me to court? Is it possible this can chase me back to my country (personally I dont think they will want to)? If you need any extra info, just ask. Could really use some advice. Cheers