I had it looked at today and the answer is that the control box for the heat/vent is not working. A small matter of [b]£781.00 [/b]to fit a new one.
The "Snow/PWR" buttons problem are in no way connected with this and so must be due to a second fault! They are tied in with the ABS system apparently.
I have had this car for about 17 months and in that time it has had 5 new wheels and a radio/cd player changed ?under warranty? and the tracking has had to be adjusted twice because the tyres were wearing oddly. As someone who has driven Toyotas for many trouble free years what on earth have I let myself in for!
Apart from all that any one know where I can get reasonably priced spares or perhaps one from a breaker?