As per the comments above, the diagnosis of head gasket failure is suspicious. There are simple checks for gasket failure you can do yourself, before going to another garage. Some have been mentioned but I'll include them all here:
- do you regularly have to top up the coolant? Is the coolant header tank empty? If so, it is losing coolant somewhere - either from a leak or gasket failure. If not, it's a good sign.
- does the coolant header tank ever overflow? If so, gasket failure could be pressurising the cooling system. Bad sign.
- does the coolant in the header tank have dirty, oily blobs in it, and have these left a 'high tide' line inside the plastic header tank? If yes, possible gasket failure. If not, it's a good sign.
- remove the oil filler cap. Does it have a yellow/brown creamy/foamy gunk on it? If so, wipe it all off, then go for a 25-mile drive at speed (ideally on a fast road so you can get the engine properly hot). After that drive, remove the cap again. Any gunk? If yes, possible gasket failure. If not, the gunk was most likely condensation build-up.
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