I am also very dissapointed in the non-up-to-date-ness of Tom Tom maps.
My house was the last on my street to be built and we have had a postcode for 2.5 Years. My house is needless to say not even close to being in Tom Tom.
In addition a friend of mine lives in Fleet, they had a postcode change 2 years ago and that is incorrect.
I was in sheffield last week and tom tom kept trying to direct me down a street that has been blocked to traffic for ages, and then when I went a different way kept telling me to go down a blocked street.

I think it is VERY poor of them not to have an update for the maps or at least care that they are wrong.
I have reported the two prblems for which I have details on the above link, I won't hold my breath though.
Matt