Hi, I think you will have a change, as you already meet the AAB asked for KCl, I applied with a distinction star, A starr for biolgoy and A for chemistry - as you do 3 alevels i think you have a high chance.
I got an offer and already going to UCL
Also the interviews are more focused when they select who to offer - so its good to remember the values both KCL and UCl love it