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If coolant was leaking directly at the turbo and into the exhaust, the car would be undriveable! You would have plumes of white smoke from the exhaust, so I guess, you can rule that one out.

If...

255g/s is enough air for approx 320bhp. I would be checking for boost leaks first.

Rear silencer could have collapsed. There's a thread somewhere where somebody cut in half the rear section of the exhaust to see that the filling of the silencer had collapsed causing blockage to...

If you are down this way I know someone who can help too

A Cooling system pressure test kit can test the cap as well as the cooling system.

Just gonna add my own experience here.

I had a mystery leak too. It started as top-up (warning lamp) once a month and randomly progressed to a couple of times a week.
I took it to my mate who did...

Could it possibly be showing a large coolant loss after initial filling due to air locking in the system. You don't say over what sort of mileage or timescale you are losing the coolant or indeed how...

There is one test you have not performed!

A cooling system pressure test.

I have one as I'm sure Tim does too. We would be able to pressurise your cooling system with the engine off up to about...

If you have a large coolant loss and no coolant smell in the cabin or combustion gas in the coolant it must be possible to see where it's going. You have a very obvious external leak that you just...

To do a refresh, bearings, water pump, cam belt kit, piston rings, stem seals and valve clearances the parts come to about £1000.

I wouldn't advise rebuilding an engine that has an undiagnosed...

I've had engine work done by Shemtek in Nottingham, can recommend him. Tim Williams is also in that area although I've never used him directly he's done work on 2 cars I've owned & has a very good...

To be fair, your going to need a sniffer test kit, cooling system pressure test kit and a laser thermostat to have any chance of accurately diagnosing this problem. My advice to you is to get the car...

My thermostat opens at 88 degree , so is the level dropping still ?. The steam from the exhaust is hard to say is it from burning the petrol or coolant.

If you've drained the system then the BARS leak will be drained also!
You don't need to pressure test the cylinders, you need to pressure test the cooling system. It will help to do a sniffer test...

I'd be inclined to agree with everything 960kg has said. If you've already used a leak inhibitor and it stopped the leak then, unless it's leaking from a hose join that you can easily disturb, you...

The Bars Leaks you put in should still be in the hole or crack that it previously blocked as it circulates with the coolant and becomes operative on finding these and will harden in the hole or crack...

Any luck finding where it's going ?

It should be quite easy to see that amount of loss.

Does it produce a lot more steam when idling than other cars and have very hard coolant hoses when running? If so it may be the head gasket.
...

Mine had the same issue until 2 weeks ago the expansion tank finally gave up... The leak was on the expansion tank, that had a small crack on the bottom. Check yours.

Mine leaks at the bulkhead connections to the heater matrix (in the engine bay) it's quite hard to see but you can feel it.

I'm guessing (from taking mine apart) that they're probably the same as the upper bolts for which there are two part numbers listed (different lengths). Have you any originals to compare?

If so...

It could've been the leaking boost pipe that covered everything with oil, it gets messy when boost escapes.

The bottom bolts do not unscrew all the way. You just rest the manifold onto them as a guide to fitting in the correct place. You only fully remove the top bolts.

If you've removed the manifold,...

check the hose between the turbo and the rip pipe is on tight as this has a habit of coming loose

As above or noisy flywheel they klunk when drive engaged, either way might be box off job.