My wife's just fixed this on. She found it somewhere in the manual (What to do if, on a separate sheet).
Symptoms: The START indicator lamp flashes.
Solution: Ensure that the filter assembly is not clogged and if necessary clean it. Start the programme again. Press the START button for 2 seconds, until the lamp switches off. Select a new programme and press the Start button again (as normal).
Colin Middleton, September 2011