Charles,
I have the Garmin StreetPilot c310, bought for an enormous discount from
Global Positioning Systems in Newcastle on recommendation from Desmondo McFinnan.
You can download all sorts of stuff from
POI handler - pubs, speed cameras (fixed and mobile, Gatso and Truevelo etc) and it's very easy to use (got it for my wife! [img]/ubbthreads/images/graemlins/beat.gif[/img]).
I have found that entering a 6-character postcode often gets you to within 50 yards of your target.