Glow-worm ultimate 50FF?

Hi, we have just arrived back from holiday where the hot water/central heating system was switched off for one week.

Upon our return we put hot water on at the control panel we found that the boiler would not ignite the pilot light and is now just clicking away, there is a spark but it will not fire up. This also happend when we tried the heating so we have neither. Is there a blockage somewhere?, we have tried to look for a red reset button but don't seem to have this on our model? Glow-worm Ultimate 50FF. Any ideas would be appreciated.