Absolutely! Scotland roads were made for driving:-) Lots of Scotland is far away from train stations, and sitting in taxis for hours is no fun at all. Get a reasonable car (forget about convertibles - Scottish rain can be quite insidious) and enjoy the countryside.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock