IMDB
Internet Movie Database page for John Gregson.

Wikipedia
Online encyclopedia entry for JG

Britmovies-
Great resource for British films, excellent forum with 3000 members.

Robert Newton
Site dedicated to the work of Robert Newton, whom played Long John Silver in Treasure Island (1950), with John Gregson playing Redruth.

Genevieve-
Comprehensive site dedicated to the car in the ubiquitous 1953 British film classic.

New Whisky Galore! Film
It appears that the plans for a Whisky Galore! remake are on permanent hold, but a site exists in anticipation. There is some background information on the preparations that have been made.

Titfield Thunderbolt
Site dedicated to the film.

Titfield Thunderbolt
Would you believe it? Another site dedicated to the film.

British Actors Home Page - John Gregson Page
A catalogue of British actors.