It was released in 2005 and came with Mapsource City Select for the USA, if I remember, and is now discontinued. The refurb would have had to be very cheap: I see remaining new units are as little as $140.
So, in the great scheme of things, you're probably better off getting a TomTom in the UK if you don't want to buy one of Garmin's map DVDs. TomTom data is from Tele Atlas (which it now owns), while Garmin uses Navteq (Nokia), but I don't think you'll see many differences between them for UK data.
There are sites like gpsmapsearch.com, but good luck wading through the content.