Hello Linc,
Thank you again for your help. I just thought I’d give you an update.
After I received your last advice I went about looking at the support material that you had provided for reinstalling the OS, as I had never done this before. Anyway I got tired and forgot to put the MacBook back on charge (as I had it to the side of the PC).
The next day we took our camper away and I brought the MacBook along so I could still use it as a grandiose charger for iPhone and iPad. Once it was plugged in I just opened the lid and entered my passcode and for some reason clicked the mouse and it responded!
Have absolutely no idea how and why that happened. That night I was working on some footage of the moon in iMovie and all of a suddenly the clicking stopped again. So, it was short lived. Mind you the next morning, it was working again.
On my return to home the MacBook started working again with the mouse clicking.
I was lucky that I was able to speak to Apple Support and they ran a through tests and decided that I needed to take it to an authorised Apple service centre. Although my Apple support had finished, thankfully in Australia we’re covered by an Australian two year consumer law so I was able to take it in free of charge.
Of course since that phone call the trackpad has been working fine and hasn’t faltered once (touch wood). The service centre looked at it and ran a few tests and said because it wasn’t doing it now they couldn’t really help unfortunately. They did advise though that it sounded like a software problem and to reinstall the OS and see if it happens again.
So, that is what I have done. Reinstalled the OS last night and all seems to be working (to repeat “touch wood”).
From my novice experience this all seems to have happened since I left the MacBook off charge overnight. Not sure if that’s just coincidence.
Anyway, thank you again Linc for your timely responses and support. Very much appreciated. 🙂