HMRC look at where you work AND where you are "domiciled"
I suspect the guy caught in Winnerhofer's post was British who was actually working abroad (therefore low tax) but he tried for no tax and they got him on the domicile - i.e he was still "really" based in the UK - house, kids, sports clubs, bank accounts etc etc
TBH most people get awa with it unless they get caught in a random check or really bring themselves to the attention of the Feds