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Just today I finished driving from Dublin to Madrid, had contemplated changing the RHD to LHD before leaving but decided I would give the drive a try on the RHD, I just changed the headlamps to the correct side.
After driving all around France and down through Spain I didnt notice any problems with the steering being on the other side other than at toll booths. Overall I found the car to be small enough for it to be fine driving it as it is. In a larger car there might be blind spots but in the mini the viewing and sight lines were all fine.