Worcester 24i Junior – Ignition Issue?

I have the above combi boiler which has recently started to play up.

Intermittently it will attempt to fire up – what looks like the pilot light turns on, but then it continues (spradically) to try and ignite. You can see the ignition continue to spark even though there is a flame.

Presure on unit perfect.

If not used for a few hours will provide central heating and hot water. After continued use the above problem strikes and things stop working.

I doubt i will attempt to fix myself, but would love some input as to potential problem(s)

Thanks in advance for any help.

Gary