This one's a bit harder to see as the DSBB photo is quite small but I found one on another site and enlarged it and changed the contrast and stuff to make it clearer:

DSBB one:
http://bbimages.digitalspy.co.uk/bb6..._outside04.jpg

Look inside the raised up bit which has the green sofas in it. There's a patio door and just inside there's a low black seat. Behind that there's a door with a long metal handle on it

The larger version with it clearer:
http://tinypic.com/5cwvb5

So where does THAT door go? It looks like a sliding door from the handle design and certainly not a fire door as a firedoor probably wouldn't have a handle as obvious as that and they usually push outwards anyway.

crikey. you have good eyesight

Well the bedroom door must be somewhere but they ain't showing us that (yet?) so maybe that is the door that leads into the bedroom.

I mean it's not the Diary room door as we have seen that and it's not a secret hidden door as it ain't very secret if it's got a handle on it - so the only thing that we ain't seen is the bedroom.

So my money is on it being that.

It looks to be a door heading into the camera run or back stage or something?

Why would housemates have a door with such an obvious handle on it, if that's all it leads to though?

So they can get out in some sort of emergency situation? Maybe they couldnt make it swing out the way due to some obstruction?

It really does look like it leads off set :S

You've done it bobbrother - I'm totally confused now!

maybe it is a lavatory

thats what I was thinking would make sense as its next to the outdoor showers