Further update......
I sent the module off to Crashdata and it came back the next day.
Managed to fit it back in and .... and..... and...... IT WORKED!!!!
Yeah!!!!!
Thankyou everyone. You saved me huge amounts of money and time.
In my original panic, I had contacted our motorhome God, Tom from Apex Motorhome Services (Kent)
I was introduced to him by Gaslo after my experience of the fragility of the AWS scheme where the previous badged individual had condemned my gas due to it not having a metal locker lining!! I now know better!
Tom had us booked in to sort some other gas issues but I had asked him to sort the module. He also suggested me removing and sending to Crashdata for speed.
When he arrived, he congratulated me on not butchering too much of the rest of the van in trying to get to the module, and explained that he used crash data quite often and it's a well known "Issue" with our make of van.
I had misread the printout, thinking it was due to low
battery. He pointed out that the comments were actually that the voltage was too HIGH.
His thought process was that if the van had been sitting around for several months, then someone gets in and drives, turning on the heaters etc, then this might be the issue. I know nothing about cars and their electrics etc, but anything is possible it seems.
Tom did some other bits and pieces for us and found the
battery was knocking on 5 years, since new, so possibly change it as again that could have contributed to the issue.
I won't go on much longer but just wanted to praise Tom. Wher the previous "AWS" guy had condemned my gas for not having the metal locker, he had not spotted a "Serious" problem, to do with the gas inlet and where the gas goes if there's a leak. Tom spotted this, adapted so that the dropouts would be utilised and we wouldn't die. That's why Gaslo recommend Tom. So, cheers to Tom.
Thank you all again.
Take care