tim wrote:

I need to repair a couple of chips on a edge of a piece of granite. Having
read through a few posts I think you can use a type of resin.

Has anyone any advice where this can be purchased- online? And advise using
it please....

How about a 2-part epoxy resin such as Araldite. You could add
some crushed granite that looks similar, when you mix it. When
it's set, file the excess off and polish with fine emery. Smear
with cooking oil and you'll never tell the difference.
You could experiment first by casting a small square of epoxy and
see how it looks.