Well, for treatment on a private 'Top Gun' MR Linac machine, it's going to cost a bit more than £30k.
But unless there are technical reasons why your husband needs access to such a specialist bit of kit, it's worth checking why you want to go private. The reason for the Hormone treatment before Radio Therapy is that it should begin to starve out the cancer cells (by restricting the production of testosterone), and thereby improve the effectiveness of the RT itself. You will find lots of references on here to the benefits of trying to get PSA readings right down ( to about 1) before starting RT.
The desire to get treatment underway as soon as possible is understandable, but don't be overly frightened by what seems a long delay: once the hormones start to work, they make the cancer clock tick much more slowly. The HT needs to be seen as an integral part of the treatment. For a variety of reasons, I have had a 2 year spell on HT before finally starting my RT, and while I wouldn't recommend that , it's not the end of the world.