Just noticed a really tiny chip in my windscreen, probably a mere 2 or
3mm across by about 1mm. No cracks emanating from it and I want to
prevent any from occurring.

The chip isn't directly in my line of sight, but is just off to the
right of said area.

From Googling around I see a number of chip repair kits are available,
but are any of them any good?

Or should I just phone up my insurance company (I'm fully comp with a
£60 excess on windscreen replacment)? (would have phoned them now but
they're closed for obvious reasons).

Ta.