Did you specifically ask for it or did your GP offer it?
I've got an appointment tomorrow. I've had very bad acne for over 10 years now and last year did two courses of Doxycycline which cleared it up to a point, but not completely and after finishing it my skin is now back to its worst. I've tried every cream and diet change/skincare routine/magic potion going and nothing makes a difference. I'm using 10% benzoyl peroxide at the moment and it's doing nothing 
If the GP doesn't offer it, what do you think the likelihood of them letting me try Roaccutane is if I ask? I feel like it's worth a try (and probably my last option now). Would love to hear other people's experiences!