Take it anywhere reputable, I'm not sure why a diesel Astra needs a specialist.
Because I wouldn't have a heating engineer working on aircon,same principles. Just less off a risk, its my work horse so cant afford for it to be off the road because some one forgot to tighten something up to a certain level because that's how it's normally done on say a ford.
Ive got astra van SE so the 1.9cdti 16v I would like to know were would be best near derby to take it, and where people would recommend ? needs a service and I would like the gear box oil replacing.