Bit of an update:
Using a power meter plug device thingy with my ancient RS RCD plugtop and low current fuses, they all powered up and got straight on with the job of being a CRT monitor, rather than boxes of impromptu fireworks. A couple of hours test of each one and a quick go on the PAT machine, all good!
Very happy to not have any magic smoke escaping at all, especially as I don't even know where you can get replacement magic smoke from these days!
