Are you really going to ship a 9 years old Mirage over the ocean? Isn't it cheaper just to buy a Mirage in the UK?
Anyway, in my Dutch Space Star the rear fog light bulb is the same as the bulb for the brake lights. Accoding to the picture @mohammad pointed to it seems the lights in the UK are mirrored too. It has the rear fog light on the right, while mine is on the left. (And yes, I have a left steer). Here you see a few Dutch Space Stars. So even if the wiring is there, it might switch the wrong light. (Depending on the glass you use, of course. Don't know if the position is mandatory.
My Users Manual contains a section about masking off a part of the headlights in left-hand driving traffic. The headlights also illuminate the right shoulder to see the road signs there. Which is undesirable in left-hand traffic, due to glaring the opponent. So I had to stick some tape when I was on vacation in the UK.
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View my fuel log 2013 Space Star Cleartec Intense 1.0 manual: 55.8 mpg (US) ... 23.7 km/L ... 4.2 L/100 km ... 67.0 mpg (Imp)