Hi there,
I was in a similar (but sort of opposite) situation. I attend a diabetes clinic which is not in my PCT area. They wanted me to attend a DAFNE course. All they did was write to my local PCT asking them to provide funding for me to attend the course at the hospital where I go for diabetes treatment. Once they obtained agreement, they booked me onto one of their own courses.
I believe that many PCTs have reciprocal agreements with other local PCTs to provide services that they don't provide themselves across all sorts of medical areas. So, I guess that if you can obtain the support of your diabetes specialist (GP, hospital consultant or DSN) they should be able to obtain funding for you to attend a course in another PCT area if your own PCT doesn't offer the service.
Only problem might be is that there tends to be ptreey long waiting lists for them, so don't expect to get one quickly.
Good luck.