Orkney was populated by norwegians and the language still has a lot of old words from 'Old Norse'.
In fact they had theor own langage called 'Norn' which died a few hundred or years ago..
A number of words, phrases and indeed the structure of Orcadian dialect still contain remnants of Norn, with words like:
Felkyo - meaning "witch"
Speir - meaning "to ask"
Kye - meaning "cattle"
A few tiny written fragments exist, such as the Norn version of the Lord's Prayer shown below:
Favor i ir i chimrie, Helleur ir i nam thite,
gilla cosdum thite cumma, veya thine mota vara gort
o yurn sinna gort i chimrie,
ga vus da on da dalight brow vora
Firgive vus sinna vora sin vee Firgive sindara mutha vus,
lyv vus ye i tumtation, min delivera vus fro olt ilt, Amen.
So if you see Cameron muttering 'Felkyo' under his breath, he's probably talking about Lisa..