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[Grumpy]

on its last 2 trips (10 mile) lost a couple litres of water

That's 20% of the cooling system in a very short space of time.
What I can't understand, assuming you're not chuffing along the road
emulating 'The Flying Scotsman', is why you can't spot this kind of
leakage on your driveway?

Your carpets aren't soaking wet, are they?

[cem_devecioglu]

lost a couple litres of water  

[ians]

My money is still on the HBV.

You said you didn't see any dripping - but was the coolant level dropping?   Did you try heater on and off and AC on and off - could make all the difference..   Usually you can see staining around the HBV when its been leaking so worth a look.

Re the thermostat - you can check its closed and opens correctly by feeling the big pipes to the rad when you start the car from cold.  They should remain cold until the temp reaches 92 degrees and then start to warm up.   Of course the stat may still not be opening fully.

If you lose coolant at a rate of litres per 10 miles you should be able to see where its coming from... just need to replicate that scenario.

[Andywill]

Found the leak.
It was the HBV, but it only leaked (poured out) when the air-con was on.
Does it have to changed from underneath the car or can it be changed from above(it looks like access would be tight from above)
Thanks for all tha advise.

[ians]

I did my 2L from below.  

Basically nothing complicated but releasing the clips and getting the hoses off is a bit awkward.

Make sure you buy one from Vx and it has text moulded on top - there are some dodgy aftermarket ones doing the rounds.  Will cost you about 30 quid trade inc vat.