As mentioned in another thread, I decided to upgrade from Vue6 Infinite to  Vue7 Complete instead of Infinite after reading the comparison at e-on. It was only after using Complete that I noticed that I couldn't change the exposure and contrast for an Environment Map - which I had been able to do in Vue6 Infinite.
Rutra pointed out that this was indeed documented in the comparison list, but under "Import/Export" - which hadn't particularly interested me. My Mistake. 
I asked e-on about the possibility of upgrading, here's the answer:-

http://www.e-onsoftware.com/support/ShowMessage.php?id=1229787101

Am I the only one that is a little bit surprised??

Rob