DigiGuide

14 days advanced schedule listings.
http://www.mydigiguide.com

On the Box

Including satellite listings plus terrestrial regional variations.
http://www.onthebox.com/television_listings.htm

BBC Online Schedules

Full details on forthcoming BBC TV and radio programmes.
http://www.bbc.co.uk/whatson/

Channel 4

Last week, this week and next week on Four.
http://www.channel4.com/apps26/listings/C4/index.jsp

thecustard.tv

A guide to what's on British television, including listings, film and sport guide, news and show information.
http://www.thecustard.tv/

Tiscali TV Guide

Listings selectable by region, day or time. Also includes programme search function.
http://www.tiscali.co.uk/entertainment/tvguide/

Guardian Unlimited: TV

Offers terrestrial, cable and satellite television listings for the day, and a guide to the pick of the week's films on TV.
http://www.guardian.co.uk/TV/

ITV - TV Guide

Details on forthcoming TV programmes for all major channels.
http://www.itv.com/listings/Customise.aspx

Sky Movies

Guide to this month on Sky's movie channels, including personal planner and search function.
http://www.skymovies.com/skymovies/onskymovies/

Radio Times

Schedules for all major TV channels, including features, film review database, guide to digital technology and reminder function.
http://www.radiotimes.com/

TV Today

Features television news, reviews and articles.
http://www.tvtoday.co.uk/