Thanks - but I should have just googled this before I posted.
I was advised to download BURN which I did but I ended using Disk Utility in the end.
I opened Disk Utility and I even think the .iso image was already displayed in the left hand pane, anyway all I needed to do was right click it and select burn or select burn from the menu.
Disk Utility advised me that the disk I had inserted (a Verbatim 4.7GB) was too small so I loaded up a blank Verbatim 8.5GB DL and away it went, took a bit of time but after it was burnt I slapped it in my PC and it was instantly recognised - far better than my previous experiences of burning DVDs on PCs using things like NERO!!! Coaster collection became massive!!
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