Fuse the red and black to the green, bypass the blue with a spriggot switch, ensuring to insulate both wires at the separation point. Then where the two reds two blacks and the green joined at the socket, black to red and green to one of the pinks. At that point introduce a yellow to bridge the black,green & red to just the black and red, again you could use a restat box for this.
Have a fire extinguisher at the ready and wear rubber wellies!
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