Was about to buy the TomTom 20 and discovered this deal - The package incl. the TomTom 25, a car multicharger and lifetime updates for maps.
The deal consists of a spend and save promotion on Satnavs & accessories, where spending £100 nets you £10 off and spending £20 gets you £20 off. Add the Tom Tom 25 for £99, then add the Satnav wet-wipe accessories for £1 to reduce the price by £10 to make £90 total. You could instead by a case for £5 and still get £10 off also however making it £95.