The software included allows you to download one "city" map.
They actually seem to cover quite a large area.
The "Hertford" map for example extends across to Harlow in Essex, and includes Enfield, Cockfosters, Barnet etc in London,
but Hemel Hempstead, which is in Hertfordshire, actually appers on the Milton Keynes map.
Go to
http://www.tomtom.com/plus/services/mds.php
select Continent: Europe
Country/State: Great Britain
and type in a town near you, the name that appears in brackets is the TomTom map.
Some town may exist in more than one map.
Something to note, it's been mentioned on another forum this morning,
that you can't navigate across maps downloaded in this manner.
Which is not good news!
The GPS obviously tracks across them, but you can't follow a route.
I've asked for someone to confirm where they heard / read this.
Alongside that statement, it's expected you will be able to buy a full Europe / UK map,
but at this time they're saying it would be 199.99 Euros,
which personally I think is insane, as you might as well by TomTom Navigator 5 Bluetooth for another iPaq.