Thanks, that has worked and can visualise through OpenJump. 

The Raster it produces (below), has only values of zero or one in its
attributes.
 I'm assuming in the calculation its not keeping the values as Floats but
its converting it to integer? Must be rounding them to either zero or one.
 
Is there a way to solve this i.e. keep the pixels as floating integers? 
http://postgis.17.n6.nabble.com/file/n4832782/ndvi.jpg 

Kind Regards,
James

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GIS Undergraduate
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