Hi @Caz31,
Thank you for your question and welcome to the Bunnings Workshop community, it is fantastic to have you with us.
It doesn't look like the chip is too large or deep, so the best course of action is to paint it to match the surrounding area. If any of the chips are deeper, or the picture is deceiving, you can use PC-11 White Epoxy Paste to fill the chip before painting.
If you have a spare tile, you can bring it with you in-store so it can be colour-matched. If not, head to your local Bunnings' paint section and grab some colour cards that look pretty close to your tiles. Take them home, compare them against the tile and select the colour that matches best.
You can then head back to your local store and have the helpful team at the Paint Desk mix up a sample pot of your chosen colour. You should also grab a fine-tipped craft paintbrush that you can use to paint the tile.
Let me know what you think and if you have any further questions, please don't hesitate to ask.
Jacob
