I have treated thousands of children in my career and I can assure you that trying to get isolation , a dry field and the time to put eg a composite filling on a conscious 18 month old is impossible. Not only that but composite does not stick on baby teeth enamel very well so it would come out within days .
Try brushing an 18 month olds teeth when they don’t feel co operative , let alone do microsurgery which is what fillings and crowns are.
In the US they may put on a crown on a chipped front tooth using just sedation. This is because they , in some places, routinely use papoose boards to treat paediatric patients. These are boards where the child is strapped down head, arms, chest and legs so they cannot move. They are barbaric and not used in Europe or the U.K.
This leaves GA as the only option.
A chipped baby tooth is a very common occurrence and no dentist , private or NHS , in the U.K. would subject a child to the risks of a GA for this . Indeed a previous poster has already said they went to Toothbeary with exactly this problem and were sent away with no treatment , which is entirely correct.
Of course you have no proof that I am a dentist , have practiced decades in many settings , places have taught and trained dentists , and practiced both NHS , private and other systems .