The symptoms, diagnosis and fix are all the same as the Omega (and pretty much every car since British Leyland collapsed).
The following thought is meant in kind concern rather than a dig or a criticism, but try as I might, it will sound, at best, blunt...
I wonder if I am alone in thinking that Terry might be starting to show his age 
Perhaps if his kids read this, that they might pay closer attention 
MMMMM

I don't know how old Terry is ,
I don't know what arrangement he has with his family ,what he gets in return for sorting their cars ,which they are obviously too busy and not knowledgeable to sort themselves ,
I do the family cars because an MOT is a minimum standard snapshot of roadworthyness 1 day a year, and on the instances my family have taken cars to garages ,it's been very expensive in money and cost me time anyway ,sorting poor "fixes" the garage have done
recent example ,the clutch on the french car , would have taken me a day or 2 , I was busy,did not fancy the job , the cowboys made a hash of it, I spent a lot longer than 2 days sorting out the refund claim,engineer's report,emails,phonecalls etc , then I had to find a replacement vehicle ,check it all over and sort any issues out .
Terry does ask questions about how to do things , this is a forum , many people ask questions , gleam useful information ,not covered in the H̶a̶y̶n̶e̶s̶ ̶j̶o̶k̶e̶ ̶b̶o̶o̶k̶ manual .
Terry is new to astra maybe a bit daunted by the unknown , many of us have had them and know common issues etc and are happy to help with advice, in the same way that I'm new to the V6 and ask for advice
this is why "the OOF" is a great forum

DG and many others have pointed me in the right direction , for which , I am very grateful

it's up to Terry to decide how old he is / if "Terry's garage for family" should farm more work out

or if he's happy to potter about ,keeping him active , beats playing golf
