Rule 176 of the Highway Code states that: “If the traffic lights are not working, treat the situation as you would an unmarked junction and proceed with great care.”
No one has priority when the traffic lights are not working.
Sounding your horn at a learner is like shouting at a child learning to ride a bike!
It is illegal to sound your horn from a STATIONARY vehicle , AT ANY TIME ! except when another road user poses a danger. E.g. When you are stationary, if someone reversing on to your vehicle then you can sound the horn.
Had the displeasure of following this driver to the shop. Did 30 - 35 literally everywhere no matter the speed limit. Please get the bus!