Water pump / thermostat hose

So the hose that joins the thermostat housing - little L pice on the left as you look at the engine from the front - is on it's way out and I am losing a little water from it. I have looked to find the part number for it but couldn't. Please could someone help me find a new hose!

200tdi engine.

One thing that does confuse me though is that I am fairly sure the number on my engine is a disco one however the turbo is mounted high up and the L pipe resembles the one on a def 200tdi not a disco 200tdi which is a slightly different shape as far as I am aware.

Thanks.