Thanks again to everybody here for your views and ideas.
I got clarification from the Apple Education team today that they cannot do anything about Volume Licensing on OSX Lion for me. I simply have to wait for Mountain Lion now. They also don't see the problem with going straight to Mountain Lion as, according to them, whatever Apple hardware runs Lion will also run Mountain Lion and there will be no problems with the Mountain Lion OSX. Apple are going to get one of their engineers to ring me when Mountain Lion comes out to discuss any issues I might have with running it straight after release as they can't see why I am so against the idea.
I have explained to them, time and again, that we simply cannot risk just going straight to Mountain Lion without any testing of software or training for the staff. On top of that they can't tell me "exactly when" in July I will be able to purchase the licenses. They fail to understand that colleges and universities only have a very small window of opportunity to get things like this done over the summer holidays and workng for the start of the next academic year. To be honest this just shows a total and utter lack of understanding of the enterprise environment on their part. The best bit is that our establishment is a case study on the Apple website! Now I wonder what I might say to anyone who rings up in the future .....
In total contrast Microsoft are looking for early adopters for Windows 8. From what I was told they will cover all software costs and even send in their own engineers, free of charge, to help get everything running smoothly. I was approached by a hardware vendor to ask if we would be interested in taking part. I of course replied "YES!"