Today's Guardian review of BBC 1's Shetland, based on Ann Cleeves' Red Bones, concludes that 'Sometimes ... a place is as compelling as a plot'. Which is pretty much what I said on this blog some time ago.
I suppose it was the need to establish the place more obviously that led the producers to introduce an Up-Helly-Aa subplot, making it all somewhat incongruous, since the story revolves around an archaeological dig (hardly likely in Shetland in January). Still, let's not get too fussy. This also gives the producers a chance to introduce various Norse mythology references that weren't in the original book. Shetland is, after all, as Viking as they come.