I will re-post the question after I get the films scanned. But, in the meanwhile, if anyone presumably know the issue I am talking about. Your input is much appreciated.
Thanks for the reminder.
The best tool for removing colour cast in an image is the colour balance tool/adjustment layer in conjunction with the colour palette (or color if you are using a US version of PS).
To remove colour cast - make sure that you can see the colour palette (this has three sliders for Red, Green, Blue. Add a colour balance layer.
Select highlights in the colour balance adjustment layer radio button. Click on a known neutral highlight. The sliders in the colour palette will show the RGB values of the selected point (e.g. 246, 234, 228). Move the sliders in the adjustment layer to make the numbers equal (e.g. 240,240,240). Repeat for shadows and midtones (NB remember to select a neutral shadow and midtone in the image before making adjustments).
If there aren't any neutral points in the image then you will need to use best judgement.
The resulting image should now have any colour cast neutralised. (NB if there are multiple light sources then you can use the same technique but mask different areas depending upon which light falls on them).