Hello again, to continue this subject, I've been back up in the loft, and taken some pics, also of the storage tank in the first floor bedroom, directly under the loft tanks.
There are two tanks in the loft, large to the left and smaller to the right.
So to come back to my original question, I want to bleed the rads, so does this mean that the overall water level is self-regulating and therefore self-filling?
I've included photos of the bedroom hot water cylinder, would anyone care to to guess whether that is a Primatic or not? As the system is old but still with some life left in it, we would be interested in helping it in any way we can.
If the consensus is that it would be worthwhile adding inhibitor, what type would you use?
Many thanks again, Smithy.