Started it last night.
Took out the old transformer (BTW anyone think it's worth trying to sell this on ebay?
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Cut the wire that was crimped, unsoldered the other from the power switch, unplugged the lo voltage plug and hi voltage plug to the tube board, out she came.
While I was at it, I changed the fuse holder as the one that was in there weirdly had no threads for the cap to screw on??? So I took that out and fitted a new one, soldered the wires accordingly. I made a mess of the nut that fits this to the chasis what with clumsy turns of needle nose pliers, losing grip and trying to re grip etc but no one will see it anyways. Eventually got round to getting the new one installed. Mounted accordingly with the screws, soldered the blue wire to the power switch, and attached the brown wire (which had a crimp thing on it that I cut off) to the white wire that the previous crimp thing had been attached to. I stripped the white wire a bit and brown wire from mdrt and soldered together, then heat shrinked the solder join for insulation.
Next step will be change the plug to either a UK 3 pin plug or an IEC male socket to fit in power conditioner. Once tested this I can do the resistor change on the board that allows 240v as opposed to 190v.