I'm in West London, you?I run the boiler to warm system but have an immersion element to warm up if the boiler is dead
I do a rad at a time so floor by floor is sort of followed as i just do the rads one by one
The machine is dumping the water you add so you're not losing water from the system and yes I test PH and TDS
Where do you live, if your local I'll show you how i flush if you like?