Thanks namsag, this is the sort of reply I was looking for. I have no intention taking my boiler apart as I value my family too much. I was after an indication of what it could possibly be to repair in terms of costs. I wasn't aware that BG or Eon did fixed price repairs, I will probably go that...
I asked for advice on what the fault might be, not to be lectured about taking the damn thing apart. I am a mature person who tends to let specialists fix things in their field. Looking at similar threads, advice is normally given regardless of 'DIY'ers' or not. Rant over.........
Have an 8 year old Ideal Slimline Classic FF350.
Normally when the boiler fires up you hear the fan start and then you hear the clicking of a relay (ignition ?). Then you hear the burner light and all is ok.
Sometimes however the boiler seems to go through a cycle where the pilot lights...