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Welcome to JA.
It appears the vehicle that emerged from the side road will be more at fault for the accident and the liability could up to 100% their fault. This is because the vehicle failed to keep a proper lookout before emerging from the side road.
Further given you are a cyclist you will be deemed a vulnerable road user and the highway codes states vehicles must take extra care to look out for cyclists before emerging from a side road because they could be filtering through traffic.
The link below states the rules the vehicle likely contravened,which helps your case
Do you understand what i have stated, if yes i will discuss the passenger's conduct?
The answer to your question is no it does not make a difference.
With regards to the passenger's conduct that will not have a bearing on who was more at fault for the incident. However it maybe something to bare in mind because if this went to court it is likely that person may likely crack under pressure given the person is gets irated really quickly.
I hope i have clarified the position if not please let me know
Dont forget to study the highway code links below as it will help persuade the court that they were more at fault.