I do as DG ,the jam jar with small amount of old brake fluid in but use the tube for fish tank air stones(under the fluid ,so air can not get drawn back up) ,very cheap ,but effective method
Not a fan of easybleed pipes and valves,the valves stick .
I NEVER clamp a flexi , just bleed the lot through .
And it will make a noticeable difference if the fluid is old (potentially 10 years old or more in Terry's case with the 2004 astra) and there was a service bulletin re brake fluid change on astra of that era.
If you have ever done the brake fluid change and seen the colour of the fluid that comes out the calipers, you'd be a convert to regular changes.
yes, some people may suck out fluid from the reservoir and put fresh in to fool the NT (MOT tester) ,If it's dirty in the reservoir, just imagine how dirty it will be in the calipers ,plus clutch line(in proper cars with a full compliment of feet controls)
GOOD LUCK with the test Terry and well done working your way through the jobs