Tried Barns idea to get the indented sensor (red spot) to pop out,but didn't work,so got a new sensor kit from the local repair shop. Part number "Thermostat Kit IMS 1701557 / C00206292". £21.00 inc VAT and a few moments of my time to fit. Perfect. Remember the one with the red spot goes to the left as you look at them from the back.Saved a lot of money as my wife was insisting on a new dryer.
Geoff from Dunfermline, April 2012