Steady on.
If you read the posts earlier you would know that I resolved the initial problem on my own with no help, working logically through the options.
My Central Heating system is all working fine !
Yes I have made a couple of minor errors along the way, but nothing major.
The re-use of the water, maybe stupid, but it had only been in the system a couple of months prior to me cleaning and adding inhibator.
The using of flexis, well as I said it should be made clearer. They state weather they can be used for drinking water or not, so surely, an extra line stating not to be used in CH Systems wouldn't be too much.
And your statement "No matter how many times, we've advised you about getting a professional in" - You advised me once. Somebody else advised to check for an airlock and then call for a professional.