blandfordp:

Thanks for the ideas guys, I'll have another go in photoshop. So far I have only used Lightroom. Unless I can do the curevs methid in LR?

Remember the colour wheel Pete? In LR the sliders are even coloured for you. Now then question time - when we have a green cast what colour do we need to add to correct for it? Answers on a postcard please or even better, move the relevant slider (Tint) in the direction of the appropriate colour. Job done

I am not sure that this is as good as what has already been posted, but I thought that I would give this a bash Pete.

Cheers
Ian