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Thanks, but that doesn't tell me whether I've done my calculations right or wrong, or made a mistake somewhere else down the line?

There are 3 pipes leaving the boiler. 1 bottom left, 1 bottom right, 1 upper right.

As you've probably worked out I'm no plumber, but that diagram seems to show the HW and CH as totally separate circuits (unless they mix inside the boiler)? If that's the case what does the valve do?

Does the pipework 'split' into separate HW and CH somewhere after leaving the pump? If so where might I find that split? I can't see anything like it, but then my pipe disappears into a wall within a couple of feet of the boiler :-(

I'm going to replace all of the old rads in my house. I'm using B&Qs BTU calculator here: https://www.diy.com/help-advice/btu-radiator-calculator/Dev_npcart_100006.art As an example result it says my hall, measuring 4.93m long x 1.91m wide x 2.27m high has a BTU requirement of 1731. I can...

This seems to be a design feature (our next door neighbour's identical setup does the same thing) but can it be designed out? It's really irritating to have to go around all the upstairs rads and lock them off at the start of summer, then open them all up again at the start of winter. The...

Ah ok. Thank you!

Yeah I've cut and fitted some new pipework. I'm waiting for a magna clean to arrive and I'm also going to rig up a flexi connector between the mains water feed and the central heating inlet, so that I can purge it with mains pressure. Then I'll put some x400 in and run it for a bit. Any thoughts...

Now the questions: The overwhelming majority of the blockage was in a section of pipe between the F&E tank and a tap valve in the airing cupboard below. Also the tank itself was sludged up to buggery. So for corrosion to be entering the tank it must be constantly coming in through the expansion...

Bringing this thread back with an update as I finally found the time to cut out the blocked pipework. This raises a couple of questions you guys might be able to answer. First the pictures:

Guys thank you so much for your help with this!

If it saves me having sh*t like this again I'd consider it money well spent. Where should it go?

Great idea, thank you!

Wise words. I can cut, clean and resolder if necessary, I just really don't have the time to do it right now. Why don't these problems ever drop when there's a couple of free days and nothing to do lol?

Yep it's oil fed from a tank in the garden.

It is also blocked where you marked it.

The magnet shows gentle attraction in the area of the yellow circle, and stronger attraction in the area of the red circle. What can I do about this?

Yes I've got a ceramic bar magnet somewhere. What should I do with it? Yes there's a 15mm pipe joined to a bigger pipe as described. The 'mud' layer is thin, only really on the walls of the tank. It's brown. Where did it come from? Yes there's a red tap valve in that pipe. It's open...

Yes more water squirts in when you push the float down.