Yes good water supply
No the water has not been turned off recently.
I'm not sure that telling me to get expert advice is worth £22. I have tried to contact Vaillant but their helpline is closed. So I came to you for help which amounted to what I did earlier.
I assume therefore that I shall not be charged the full amount.
No I do not have a voltmeter
Why do we need a volt meter. My understanding is that all that is needed is to fill the heating system via the filling cock. I have no idea where this is or how to fill the system even if I did. I thought that you,as an expert, would. If you don't then please do not waste my money and your time.
Video gave the correct information that I needed to resolve the problem.