About Gimli and the Scottish accent...it's not pitch perfect by a long way, he slips into Welsh at times.
One example is in this
deleted scene. When he says "last one standing wins" there's more than a touch of Welsh. Shut your eyes and it could be a gruff Anthony Hopkins.
Now,
why do people associate British accents with anything that has a 'medieval' feel? Could that have something to do with the enduring influence of Shakespeare? Readers view Shakespeare as representing Ye Olde England and he is their primary touching point for non-contemporary English usage. Hmmm?