Check your insurance policy,most these days cover it with out loosing your NCB but with a £60 to £100 excess.
My wife is having her screen done next week, excess £75.
Remember it needs to be a crack for replacement. If it were to get hit by a fast stone and knocked with say a hand, it will crack
Has not got to be done on the road it could be accidental from your strimmer whilst gardening.(house insurance)