Visiting Shetland today to campaign for the union, David Cameron spoke of 'this, the most far-flung part of our United Kingdom'. Now this rather depends on from where you do the flinging. For Shetlanders it is London, or perhaps Edinburgh, that is far flung.
I am reminded of a tee shirt I once bought in Lerwick. It parodied the usual map of the UK where the Shetland Isles occupy an inset box in the top right hand corner, somewhat south and east of its real position. On the tee shirt was a map of Shetland, while the rest of the UK was in an inset box to the south west.
If you want to avoid appearing London-centric, the term 'far flung' might not be the cleverest use of language for islands that promote themsleves as being at the centre of a maritime crossroads. But everything is relative.