Just been through something similar.
Bashed the rear of the car, 3 different panels affected, thought “this is going to cost a fortune” so started a claim.
Next day at work mate says his uncle does car bodywork and quotes me 260 quid, my excess was 275.
Cancelled the claim but insurance still have it listed as an incident even though no money was handed over from them or action taken by them.
Fast forward a month to renewal time and my insurance had gone up by 200 a year due to this incident being reported, so I just cancelled and went elsewhere as they (compare the market results) were still slightly more than my older premium due to me (stupidly) admitting to the bump but nowhere near 200 more.
SO, if it’s a small bump / scratch etc get a quote before you contact insurance (unless you have no choice due to police involvement etc where lying about timescales might void insurance etc..)