web services for distance calculation

hi guys

I need to calculate distance between 2 UK postcodes using below example

https://dwbi.org/etl/sap-data-services/115-web-service-call-in-sap-data-services

can you tell me if there is any active webservice link to calculate distance between 2 UK postcodes..

I tried below webservices but lost to which function needs to be used

http://www.SimplyLookupadmin.co.uk/WebService.asmx?WSDL
http://ws.cdyne.com/psaddress/addresslookup.asmx?wsdl