I am also in the UK, and I bought my 60CSx last week, and am totally blown away with it.
The basemap is pretty useless out of the box, but once I added a 2 GB micro SD card and a good chunk of TOPO GB (v2), the thing came to life..
The auto-routing is far better than my dedicated car sat-nav (Road Angel Navigator 6000), the routes seem so much more logical, and re-routing is way better.
And as a side note, the GPS coverage when in buildings or under deep foliage is simply superb.
Paul.