[Station X]

I personally wouldn't use chocolate block to attach a new mains lead.

It isn't clear from your pictures whether the mains transformer wires are brought out to tags or wires. If the former solder your new leads to the tags. If the latter the wires may well go to a tag strip where they connect to the mains lead.

EDIT. Having looked at the circuit diagram It appears that one side of the mains lead goes to the OFF/ON switch and the other to the voltage selector, so connecting to the mains transformer may not be necessary.