really not sure what you are so bothered about here. and not sure of this terrible advice i have supposedly given - my advice basically amounted to 'wait and see'... same as many others here.
as i said - i responded to the OP, which does not mention the whiplash claim, and i like others, would not have expected a claim letter so soon, so i advised her not to notify them just based on a 'maybe', when her own vehicle is barely scratched, because you dont have to tell your ensurers of every time you barely touch a bumper - as they are designed to able to take a minor tap.
now shes had the letter, she must find out if its real or not, and if so then obviously she must speak to her solicitors, but thats a given i would have thought ... and wasnt what she was asking - she was asking if she should notify them on a 'just in case' - and i said no - and i stand by that.