Well she's booked in with MG Mobile mechanics at the end of April so will go from there. Won't be able to go POL in her but at least it's getting a proper diagnosis. Gives me a month to get the radio and bodywork sorted
Seems to point more towards an oil cooler fault than HGF so fingers crossed. If that is the case then I will be quite annoyed with the chap at the second garage assuming it's HGF.