[Raistlin]

You might not want to push it as far into the corner as you will need to in order to pick up the wooden stud work.

I would drill a small pilot hole and then push something long and thin through it into the loft space (something like a nitting needle for example) and then go into the loft and see if you can find it. THen you can see what's up there in the place you're going to mount the pole.

You might decide it's worth fixing a baton between two studs so that you can screw the pole into something firmer than just the ceiling. If you've got decent plasterboard fixings then you should be ok though.