I am currently trying to map some site addresses into Map Point 2002 by their district post codes. I have found that post codes from the Post office web site, do not map into Map Point and that Map Point has a different post code for the address.

Is there any way you can update the current post codes within Map Point with updated post codes from the Post Office? :?:

There's not... you'd have to re-code your data before bringing it into MapPoint.

This article may help you some:
http://www.areadata.co.uk/maparticle1.htm

Eric