OnTV is surprisingly good. While it doesn’t provide listings for all British TV channels you might require, it certainly provides listings for the most popular, such as the BBC channels, ITV channels, Sky Sports and other UK TV based channels.
While it doesn’t feature any regional options (something that future editions should address along with an expansion of provided listings), OnTV is certainly good enough for British users to install and keep on their Windows Mobile phones in order to make daily checks and receive reminders when their favourite shows are about to start.
The lack of any form of haptic (vibration) or graphical feedback when an option is selected is an unfortunate omission from the user interface.