Andrew Young
Fairly common issue on these.The breather system inside the cam cover is goosed.You will need to replace the complete cam box cover.
Message Thread 
Astra 2007 1.8 Petrol 2007 - High vacuum on dipstick and filler cap? - Fixed # - Colin Barker March 23, 2017, 6:04 pm
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on March 23, 2017, 6:08 pm, in reply to "