If I could offer a suggestion, It might be worth a check on the main radiator. My 2.8 very slowly used a small amount of coolant for quite a while requiring a small top up every few months, no obvious signs of leaks or unwanted puddles anywhere, then when we had the only really hot day last year after I parked it after a 20 mile drive and it began to cool, coolant began a steady drip from the OSF. The rad despite looking perfect from all the areas I could physically see it had begun to corrode in the bottom corners and finally gave up the ghost. New rad cured the blighter but the leak wasn't visible at all up to the point it popped its clogs! The radiator sits against a sponge strip (presumably to stop it rattling?) that was absolutely soaked, it seemed to be holding the leaked coolant and then letting it dry out in use effectively hiding the small leak it had. Might be worth a check?? Hope you find where its escaping from!
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