Maybe postcodes in the UK are more localised - when I enter mine into a internet map site the arrow points right where I live. Full post codes are specific to a small group of houses in the same street.

No problem really - after all when we give our house address to anyone that takes them right to your front door, if they feel so inclined.   But if people are worried about getting stalked or whatever, best leave out the end bit of the post code, so it's a bit less specific, at least if you are in the UK.

Other than that this seems an excellent addition to the Mudcat (along with the Mudcat flickr group that InOBU has just set up.)