Nick,

use imgburn,

Download it, then install.

Open ImgBurn
Menú Mode - ISO - Write
In "Source - select a file..." - click on the icon with the yellow folder
Select "Image_file_name.ISO" - Open
In "Destination" it will show the model of DVD recorder, if you have various select where you want to record.
In "Settings - Write Speed", select "1x" (I go no higher than 4x speed)
Put a blank DVD into DVD recorder and "ImgBurn" will activate the gray button bottom-left to record it

ImgBurn : http://www.imgburn.com/

Hope this helps.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.