Kestrel,
If your father doesn't want to go down the SAt Nav route, or spend the £££'s then check out the June 2006 edition of "PC Advisor" magazine at your local newsagent ( £3.95 ) - It has a free cover CD containing a full version of "Map & Travel - Travel Planner 2006 / 2007 for UK and Europe"
All that is required is to register the software on line to be able to use it.
Various route planning options as you might expect with up to 25 stop off points, history of previous start and destination addresses, speed profiles for calculating journey times, route options - shortest / fatstest / cheapest etc, cost management, zoom functions and printable maps.
( Mod - this isn't an Ad. for PC Advisor or the software - just trying to help a fellow 'pruner
)
Coconutty