I too just bit the bullet and asked. I was told I had to prove I was loosing weight myself and to come back in a month. I replied I had lost half a stone in the past 3 weeks on slimming world [at the time] and my doctor said if I came back and showed him my book as proof he would prescribe it.
I made an appt for the next day and had the script in my hands within five minutes hehe. That was last August x