A white roof will make a big difference as John mentions, the Zermat Silver colour is also good as it is very reflective.
That said the best option is a twin skinned roof (e.g. the old "safari" roof) or a full length roof rack as this provides an air gap over the roof.
The slab sides and vertical glass of the Defender actually aid in keeping the heat down, especially the small steep windscreen (even more so when driving as you're not in the direct sun) as there is far less direct sunlight entering the vehicle. The alpine windows are another mater
MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
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