Insurance/accident advice

I work for an agency as a van delivery driver on an ad-hoc basis. Today I had a minor accident where I misjudged the space avaliable to overtake and I caught the other vehicle with my wing mirror, bending their wing mirror back and smashing the adjacent window of the other vehicle. I reported this immediately and was advised by the fleet office to exchange details and take pictures of any damage. When I arrived back at the depot, the fleet office advised me not to worry and it will all be sorted through the company insurance. I asked them do I have to declare this incident to my private insurance (my car insurance) and they said no.

I have done my own research into this online and what I have read is that you have to declare the incident, even if it happened in a company/fleet vehicle.

I already have 2 claims in the past 5 years- a fault claim and a non fault claim on my record, and could do without another one going on my record.

Could anyone advise on this? Thank you in advance.