Having realised that almost any renderer will churn out a washed out image, I've decided to post-process my renders from now on.
This is done by importing the .jpg file in photoshop (although any program with a histogram will do), the black threshold is then defined in the levels dialogue box either by using the colour droppper or moving the black slider to the right. This is then repeated and adjusted with the white point. This has the effect of squeezing all colours available in to between the two markers, contrasting the image. The curves and gamma are then adjusted to meet my requirements. Here is an example of what this method can be used to do:
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