PBL is in fashion at King's as much as fluffy pink fake fur coats are these days so if you want pbl look somewhere else. Not to say that there aren't pbl but it is limited.
Mostly it is lectures, big lectures, 400 students in one room snoring, there is something in the air of that lecture theatre. The smaller groups they are talking about are usually about a subject where you get a few questions and you answer them at home before you go there or it is that you get a few questions that you answer in the 'workshop'.
First semester is random catch up lectures to make sure everyone knows the basics and you learn more anatomy and physiology.
second semester through second year you have lectures based on a single organ, disease or something like that. You start with a week of high blood pressure, then you get a heart attack, then go into heart failure and so on. Since you don't know enough about the subject and it isn't the point you get some general knowledge about it such as why it happens, common drugs, how they work etc. Dissections, histology (microscope thingie), patient interviews, random ladida is dotted throughout to get you away from the lecture theatre.
Check out the time table here:
Course Information [Medicine] In short it is mostly lectures.
Go into MB BS1 and go onto timetable and you can see what it looks like. Whenever it says Greenwood for location it is a big lecture.