You can find the zip file containing the question paper, answer guidelines and comments for paper B 2011 here.
I am putting my answer here so that we also have some paper B contributions. I remember this paper confused me quite a bit: in 2011 it was not enough to spot suitable features from the dependent claims or from the specification and use them to draft new claims in the light of prior art. Instead it was asked to redraft the claim and change the claim category. Never had done that before and it threw me off the track, so there may be some nonsense in it. You can try to spot the mistakes.
Here is my suggested claim amendment for cases/scenarios 1 and 2.
I have also uploaded my answer script.
how many marks did you receive for this answer?