No pressure when cold and climbs high is when hot plus water comes out of the expansion tank air inlet valve when the pin is pressed in. No way that I can replace the original vessel, but no problem with an external one as long as I have the right size.
13 rads of varying sizes.
The original vessel looks to be about 6L (est) which seems small compared to the sizes of external ones on sale. I presume it is better to go large.
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