In reply to Postmanpat:
No it wouldn't invalidate. *Technically* you're probably supposed to declare the accident to your insurer and declare it with any renewal quotes you get but if there's no claim then the accident never happened
It might be different if the police were involved in the accident. A lot of insurance companies want to know about both accidents OR claims to calculate quotes but the former is honesty thing, given nothing on record. It may bump up your insurance costs at renewal time if you tell them.
Post edited at 20:18