I'd get someone else to have a look, ask friends and family if they know any garages they trust. Mobile techs can be quite good, more in it to do a job of work and get some honest cash, compared to landed concerns who view their customers as a money mine.
A 1 litre Corsa ain't rocket science, I reckon you'd get an honest appraisal for £30 for an hours work from anyone with a few spanners, a laptop and an op-com in the van. Call a few up and tell them how you fear getting ripped off and just want to know whats wrong with it.
Did you ever remember to get the oil changed?
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