It's a four-day intensive course and Mushym, along with other stammerers, are determined to find the courage and resilience to find their voices.
Amongst those joining Mushym is 23-year old Vicky Croft who developed a stammer last December following a minor stroke. She's now more likely to stay in than go out with friends and is desperate to get back the bubbly, confident person she was before her stutter.
Together, they learn new breathing techniques and tackle talking on the phone and even public speaking. Can they get their stammers under control?
Stammer School: Musharaf Finds His Voice, Channel 4, 9pm
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