The interview on 18th was unexpectedly pleasant :-) The interviewer asked me about my programming experience and interests connected with computing that I mentioned in the personal statement. Then he showed me many projects that the university is involved together with their students. The math questions covered mostly calculus. Most of them were basic and easy but he wanted me also what is a derivative formally. Then, when I got stuck once so he showed me how to overcome the obstacle I had met and I reached the result. He was pleased so we finished with mathematics. After that, there was my turn - I was to ask some questions and so I did. Finally, he told me I was a strong candidate and he will write a recommendation for admission tutors so I became extremely happy :-) And still I am. I wonder if an offer will come as he 'suggested' and when. And surprisingly the conversation took over 40 minutes. All in all, I am still amazed with the last sentences of the interviewer and I am looking forward any responses from the Imperial.
If I could give anyone an advice, I would recommend them to be themselves! There is no need to be nervous and stressed! Believe me! They are really nice people who have very positive attitude towards their potential students - at least it is my impression :-)
So, good luck on the 2nd of December everyone! And in February and March as well (There are also some interview days, aren't they?) !