Here's the update on the astras running issues.
Changed out the fuel filter this evening, and after a rough start and idle, she seemed to pick up. Took her out for a test run, and first junction after a mile, she cut out. Restarted straight away. Went on a run for about ten miles, and withhaving to stop every so often as it's narrow country lanes around here. She had no issues of stalling. Gave her a good hard run on the clear straights, and yes she's back toher good old self. Pulling like a trojan, and stopping without cutting out.
So if anyone has these issues. Then I suggest replacing fuel filter.
Tomorrow we're off to the coast. So some fresh fuel and a good run should sort her out.