I think this depends on you computer settings.
For XP go to
Start > Control Panel > Regional & Language Options.
Then on the Regional Options tab make sure you are set to English (United Kingdom) and the Location is set to United Kingdom.
If you click the Customise button you should be able to change any settings that are not correct.
I don't know if this will change any text already placed, or if it only applies to new.
bc.
2.4GHz Core2 Quad, 4GB RAM,
Quadro FX4600.
Where would we be without sat-nav?