I got a Smart 42 Tom Tom for Christmas and the postcodes seems to be a bit 'odd'.
For example, my work post code is NE1 4DP. When this is typed into the Tom Tom, it directs you to a location about 2 streets beyond the correct location (to Sunderland Street). However, when using the MyDrive route planner, the post code is in the correct location (Waterloo Street).
I've updated the maps and I'm just generally a bit confused. The Map Share Reporter also directs the post code to the correct location at Waterloo Street too.
At the moment I don't really trust what the Tom Tom is saying. For the majority of the time I'm putting my trust in the sat nav and if it does this into the future it will be quite problematic...