Training costs for Win7 OR some Linux distribution both fade into nothing compared to the black hole that has been the NHS's NPfIT (National Program for IT) and CFH (connecting for health) which has seen billions disappear without benefit to companies like Accenture (coincidentally, the board of which Patricia Hewett, Health Secretary at the time, sat upon). If you saw some of the ancient Heath Robinson systems that provide the back-end in the NHS, you'd be horrified.
I no longer work in the NHS, but I well remember the systems that were used by Primary Care (your local GP surgery, walk-in clinics, etc.) for submitting patient statistics. QOF was the name of it (Quality and Outcomes Framework) and it formed the basis for how GP surgeries got remunerated. This system was nothing but a pile of web-forms that numbers were typed into (number of diabetic patients, number of BP tests, etc.) with a little bit of simple arithmetic at the back end to work out some percentages and see what your payment was. They couldn't even keep that running. In many instances, surgeries would submit their data and then maybe that afternoon or the next day, the results would be up. Think about that. It's web-forms that run the submitted numbers through basic arithmetic. Probably about two to three hundred calculations in total (all of the number of patients / number of relevant checks type of calculation), and it took hours, sometimes days, for the results to appear. Computers don't work that way. You know what it tells me? Their system wasn't working and someone at the back end was having to do something manually to get those results up. Whether that was copying them from one database to the other, feeding them into an Excel spreadsheet or what. But it was a joke. The punchline - it cost many millions.
Quite frankly the NHS could use pocket calculators on their desktops if they wanted, the organization would still bleed fortunes so long as the corruption at the top that allowed Accenture, Atos and others to charge billions for something a small team of programmers could bash out in a few months.