Don
I would recommend getting it fitted, as it won't look right if it's the wrong size and it'll also give you an oppurtunity to learn how to wear it.

Is there any likelyhood of me being able to hire one in Scotland and getting it send down here? I guess the main issue would be not being able to try the stuff on first and cost of postage?
Definitely this. It's surprising the amount of people who get kilts that are way too long and it looks so silly. A kilt should be the length that if you kneel down the kilt edge just touches the floorThe kilt itself should come down to the middle of your kneecap ideally so fitting is advisable.
Isn't the whole idea of a specific tartan for a specific clan a quite modern invention?