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Yeah mine is not the best, still I think it is the heater matrix needs renewing, but according to the haynes manual it is a pain to get to. Let me know how you get on, a new heater matrix is about £39 from GSF.
Before worrying about trying to fit a new one get your cooling system flushed out and see if that makes it better, Its an 8 hour job to fit a new one at a garage!!!
Signs of head gasket failure could be, high pressure when you take the cap of the water bottle after a short run, the water generally has an film of oil over it, but also when I spoke to you, you said it was drinking the fuel this is also a sign!!