Quite correct SimeltdUK, I moved to Northamptonshire about 2 years ago, didn't mean to throw anyone off with the mention of OZ, just providing a reason for my own ignorance!
These systems don't seem all that complex to me with regards their operation (I am an industrial control systems...
I'm from Australia where we don't have central heating, so I'm new to how these systems work. I've done a fair bit of reading, unfortunately none of which has helped me understand the symptoms my boiler is showing.
I filmed a short video of it "running": https://youtu.be/U11Yh4R7PNY
In...