Confusion on a mechanics question?

I am practicing for the PHYA2 paper on thursday and due to completing almost all the available past papers I have begun trying out some legacy papers. Now this particular one is PA02 JAN09. This is the question:
http://www.egsphysics.co.uk/files/a_level_past_papers/Jan09/AQA-PA02-W-MS-JAN09.PDF and this is the mark scheme: http://www.egsphysics.co.uk/files/a_level_past_papers/Jan09/AQA-PA02-W-MS-JAN09.PDF
The question is: by taking moments about B find the magnitude of P.
Now I don't necessarily want to know how to answer this, more if we should be able to answer this question as part of our specification? I find that many of the questions in the legacy papers are impossible to answer with our knowlege as of course much of the spec changed. Therefore even after looking at the markscheme for this I was really stuck. Should I be able to answer this? If so, tell me how, but if not then fab!
This is the question sorry! https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xta1/v/t34.0-12/11358895_10200871613588043_1297223995_n.jpg?oh=a4a293d4935b0f20694b199477867908&oe=556E7581

http://filestore.aqa.org.uk/subjects...2-QP-JAN13.PDF

could anyone explain why in question 3 b ii the tension is acting as an anti-clockwise moment? normally good with the moment stuff but i thought way too deeply into it trying to make a triangle as the tension is acting to the left which doesn't strike me as anticlockwise. thanks!

Even though it's acting to the left, the brake cable would pull the hole it's attached to towards the left, which if you imagine with that arrangement, would pull the bar anti clockwise about the pivot. I usually just try to imagine which way the body would move by placing my finger on the chosen pivot. In this case, you can see that pulling left above the pivot would turn the brake anticlockwise about it.
Sorry if that's an awful description ahaha.