Yeah I feel sorry for the people with the damage but ime it will be hard to prove negligence and the insurance company won’t care too much.
I’m in a very similar situation and my loss has totalled 40-50k and even though my neighbour caused the incident (a fire) which started in their property seems like they won’t be held liable. Personally I’d have thought grinding a car metal work during a heat wave and then tossing a hot bit of metal into a tinder dry hedge was negligence but legally it appears not.
id have thought having a dodgy tree was also negligence but might be hard to prove.