I appreciate everybody's input...all tests were done to try and bring the emissions back in but they were well out not just too high!!
I've had genuine cats fitted only a couple of years ago with every possible conceivable item thrown at it..lambda sensors repeatedly.. all cleaners to try and clear up the emissions. The head gasket isn't the issue here it's the fact that the head needs to come off to diagnose anything untoward and replaced so there's best part of £700 before anything else!!
I haven't got anywhere to store it at home until another recommended party is able to look at it as I know it can take months due to their popularity.
As the garage said they are happy to do the work and I'm happy to pay for it if I thought it was a viable option but the rest of the car is going to need some sort of restoration following on from this and there comes a point when you have to weigh up your options!

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