Worrying about whether or not you meet the "cut-off" or not is the worst thing to do, even though it's practically impossible not to at this stage in the game. You could have an exceptional personal statement that happens to get you in with a lower UKCAT, you could be pushed up on the scale due to your GCSEs, or to be in the top 25% you may not need a score of 890. I got a rejection from King's just before Christmas last year, worrying about it made it worse. Pour yourself into A-level studies, or work, or into refining yourself for interview (you applied to four med schools, you only need one shot).