I managed to take a much better photo today, just had enough light for a few minutes, no sun and bright overcast skies. Plus I shot it in raw and calibrated the white balance, which of course is the minimum. Next step buy a colour chart ;)
The original is slightly warmer but I got as close as possible with just guessing, as opposed to having a proper colour chart etc. Now my main problem is to work out at what zoom I am at 50mm on my bridge, to avoid deformation, I don't really know how to work that out yet.