On Saturday I found that the breather hose on the our Peugeot 306 1998/S
1.4l petrol engine had broken.  It previously had been covered with
insulation tape and was quite oily - however, when I changed the air
filter I discovered it wasn't actually connected at all!

A picture of the hose (with break) is here:
http://www.swampie.ukfsn.org/IMG_2950_Large.JPG

Unfortunately I can't see a way of repairing it easily, so I wondered
whether replacing it would be the best option.  For now I've reattached
the two pieces using 50mm masking tape! (It's all I had!)

Any idea what the symptoms would be with a broken breather hose?  I've
noticed the car is quite lumpy sometimes (runs fine, but can be a little
even during idling etc).  I noticed that the whole exhaust pipe moves
significantly during idling, which probably is causing our regular
failure of exhaust pipes (front box one year, rear the next).  Just had
the rear replaced when the middle rubber support snapped, and whole
system dropped, punching pipe into otherwise perfect rear box).

So - is this a Peugeot only part?  The hose has quick release connectors
on both ends, so I'm wondering whether it's a Pug only part.  I have a
GSF Car Parts factor close to me (Farnham) or Peugeot Aldershot if
necessary.  Any idea of the cost?  Any suggestions as to a suitable
air-tight repair?  It's quite oily, and not a flat surface (corrugated).

One final question - what is the actual name of the part I should be
asking for, and what does it actually do?

Thanks

D