The article by Desmond Bagley was published in the 24th February 1980 edition but unfortunately no back issues are available any more.
It was called "A Little Peace of Britain" and the author's fee was donated to the Royal National Lifeboat Institution. The subject was a quick tour of the island of Guernsey where the author had made his home since 1976. He clearly loved the place with its quaint social idiosyncrasies, enjoying the peace and quiet, the climate and an easy access to the sea.
The magazine can be found indexed rather wonderfully, but unofficially, on the Internet at:
http://www.saunalahti.fi/~hurmari/inbrit.html
By mail
their official contact details are:
British
Tourist Authority,
Thames Tower,
Black's Road,
Hammersmith,
London W6 9EL,
England.