Sorry to hear that you mega bored. Revision used to put me to sleep. So, are feeling better now?
I was annoyed about the King's interview as well. Their MRes programme only admits 6 people per year and its quite a good programme. Maybe I should email the dept. and ask them if I could get interviewed sooner, as I have other offers in hand.
The UCL one is a 4yr funded PhD programme, so if I get it, I'll go for it over the 1yr MRes at Imperial. If I don't get into UCL, then its Imperial and afterwards I'd go on and complete a PhD.