You COULD have searched for a manual and read that.
You COULD have searched for - say - rangemaster leisure 110 ignition.
You'd have found things like this:
https://shop.ukwhitegoods.co.uk/rangemaster-ignition-spares
which kind of suggest the ignition is mains powered.
Maybe the lead to the ignition electrode is damaged. I've seen that on other cookers. Maybe the ignition module is knackered
Maybe the ignition electrode is misplaced, damaged or obstructed.
Maybe the pilot burner is covered in crap.
XXX, January 2017