UK Postcodes
This is pretty consistent with using the google api directly its not really a Pro Maps issue the recommendation is to use the street and town rather than the UK post code - If you really want to use the UK Post code then you can use a low cost online service which will look up the postcode and return you the geo coding that you can use to draw the map with Pro Maps.
You can find it here - geo_credits.htm
Best regards
Jon