Well... As some of you know I've had a balance test fail which we believe is the injector. Picked the car up on Wednesday and now I seem to have a massive Oil leak from somewhere, can't pinpoint it yet but more worryingly I have just checked the coolant and found a grey waxy substance around the Rad cap... no sign of anything on the rad cap or on dipstick and the coolant is clear as (no sign of oil) but I know fear the worst... I've had a compression test done recently and all is fine but if the break is between the oil way and a waterway it won't show there... I'm going to try and get a sniff test done but I'm now really worried... I spent 7K on buying the car and so far another 1K on sorting bits out and now this... I can't afford to pull the engine at the moment so not sure what to do...

Your balance test fail should point to what cylinder is down and you can then examine the injector connector and coil pack connector for that cylinder as one of those could be favourite for dropping that cylinder. The grey waxy substance could just be some previous attempt of radweld or similar stuff. If you are way down on oil and its not leaked then its being burned. Remember the zed engine does not hold a lot of oil, only about 4 litres max. So burning a little oil could soon drop a litre and make it look like its gone right off the dipstick.

Your coolant is clear so hope for the best. Also your compression test was good. If it was an oil way to water jacket break the oil pressure would soon put oil into your water giving major salad cream and the pressure would collapse leading to a siezed engine.