Welcome to the Bunnings Workshop community @Mark08. It's fantastic to have you join us and many thanks for your question.
The key to successfully restoring the setting is in the preparation of the surface prior to painting. The more time you spend removing the loose and flaking paint the better the topcoats will adhere.
Here's an easy to follow step-by-step D.I.Y video on How to paint metal which I trust you'll find useful in your restoration project. The techniques used in the video will be the same as restoring your furniture.
We look forward to seeing your project and would encourage you to share some images with the community as I trust many members have similar furniture in their own backyards.
Please let me know if you need further information or had any question on the process.