this is where i came unstuck, coming into 5 (from the west). if you don't go up the stairs you end up in some toilets. which is of course quite obvious.
then i f*#ked around at 6 for a bit, not sure how to get into the control. what are these bits of black/grey across the small paths? crossable or uncrossable? do i have to go right around the outside and in from the east? i didn't. but i stood there long enough that it would have been quicker to.