What you actually need to look at is this document;
http://www.hm-treasury.gov.uk/d/cond...or_summary.pdf
Also if you type "statutory residence test" into the search box of the HMRC website it'll lead you on a trail which goes via the treasury website to this document. All worth reading.
Particularly the bit about international transport workers in the link document.
Those of us working abroad for foreign airlines are apparently being lumped in with Nigels living in Provence or similar for certain parts of the test.
The basics are though that if you work overseas full time and spend less than 91 days in the UK you're good to go.