folding door

Whatever you do, don't have the hinged part - the middle bit - facing the lavatory.

I stayed in a B&B like that one, because of the lighting in the bathroom people on the landing could see anyone on the throne.

Mary

You can buy bi-fold door gear from any of the sheds or a BM. The kit consists of hinges to hinge the 2 leaves together, an upper track to guide the free edge of the second leaf, and pin-type hinges for the top and bottom of the first leaf.

If the current door is the usual sort of hollow internal door, it's not a good idea to saw it in half because there's no framing in the middle - and nothing to fix your hinges to. If it's solid, you may be able to.

Some of the sheds sell half-width doors, in pairs - which you can hinge together using the kit mentioned above.

I guess you could use either a bi-fold door, or one of the concertina type The next problem you will find is how to lock it when you are in there

- some sort of metal loop and bar arrangement?

I got a moulded "panelled" bi-fold door from B&Q a while back. They are "fun" to hang as they need to be vertical in both front/back and left right planes or front/back and in a true square frame. It's a while since I fitted mine...

It might be but modern internal doors are constructed out of 1/8" ply and a honeycomb light card core. The edges would need a block of wood fitting in and unless you got the cut *exactly* straight and square the folding won't work particulary well or not at all.

Why bother?

Do you know any good tunes to whistle then?

Like I said, why bother? Or have you got something no one else has?