British maybe, but not a Shetlander....rightly or wrongly you will be termed a sooth-moother indicating your non Shetland origin.
i am british paul not a immigrant getting to a point where i wish i had not said anything , its a dog eat dog world we just have to give it your best shot you only have one chance . i feel a lot of hostility towards me/incomers why ?
You've hit the crux of the matter by assuming because you're British you aren't seen as a foreigner to Shetland folk.
Lerwick's own high street has its own high percentage of empty shops.