Was in the new Costco in Croydon today and saw the cheap and cheerful Navman S30 Satnav. It's £74.95 at Amazon, so this looks like a good deal. It comes with maps for UK and Ireland.
Here's the blurb..
Navman S30 (UK & Ireland) - More Stylish. More Affordable. Even for an entry-level sat-nav, the S30 ticks all the main boxes. The slim, stylish S30 works straight out of the box and is simply a joy to use. Hidden inside its slender frame is a host of features including comprehensive maps of your country, Safety Camera alerts, and an intelligent Day/Night display. The S30 is perfect for anyone who wants intelligent, powerful navigation at an affordable price. FeaturesThe Navman S30. Stylish yet affordable navigation, with:Stylish intelligent designPre-installed Safety Camera Data ? Free trialSafe, easy to use menuUp-to-date maps with Navman?s iUpDataCrisp clear map display on 3.5 inch touch screenIntelligent Day/Night display In the Box: Navman S30 (UK & Ireland) Car mount & bracket 12V in-car power charger Draw string bag USB Cable Documentation pack (user manual, in-car installation guide, warranty document, GPS FAQ guide, help and support sheet)