EGGW is correct.Having filed my return for last year, I was indeed taxed on some of my salary while I was on UK nightstops.I have property in UK and as a citizen,i'm required to declare my time in UK while employed as Aircrew. A rather complicted (to me anyway) formula is used and you end up paying a small amount
.......I think it was less than £200. There are many people who don't bother but if you have assets in UK and you receive income from these,then you need to complete a tax return and as a result,declare you Salary and time spent in UK during layovers... regardless of 90 day rule.
Bugger!