I ordered the toroid (750VA, 2x24v), power regulator board (60,000uF 100V capacitors, 20A rectifier), double pole MCBs for each power supply of various current rating with type D trip, DIN rail, DC fuse box holders.

Whilst waiting for this stuff to arrive I looked again at the blown SMPS and noticed a tiny glass fuse tucked away in the corner and soldered direct to the PCB (F2 - photo shows it removed).
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It was clearly blown with black on the glass. I managed to cut the legs and get it out to read the rating and it looked like 250V 15A (printing was faint so not sure) about 3.5mm wide and 10mm long. Bit of searching revealed it was called an axial lead fuse and only they cost a few pounds for a pack of 4. Started to wonder if I could repair it and get the machine running for now until the linear supply was here and built. So I took the board out but discovered alot of damage underneath, some of them were charred surface mounted components. Even if I replaced the fuse and it worked would I trust it? Decided not.
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So I need to wait a few weeks for all the new linear bits to arrive. No doubt I'll post any questions I have at that time so I don't get any more blue flashes. All for now.