Elddis Pamperos XL Replacement Window

Hello everyone. I am brand new to caravaning and I picked up my first caravan today but the caravan site I removed it from had a very small entry gate with a tight left turn and I hit an old hinge poking out of the gate post and broke the side window (ouch!). I'm finding it difficult to find a replacement. Does anyone know where to get one. Your help will be much appreciated.

I'm in Wigan and the caravan is an Elddis Pamperos XL 5 Berth. The window is at the rear right hand side. Heres a pic of one http://is00.thegumtree.com/image/big/99282100.jpg Its double glazed unit.