Ambien prescription in the UK?

I have been taking Ambien for a long time, it has completely changed my life in terms of me being able to sleep soundly and go to sleep quickly. I have felt less depressed since I have been taking it, and I am able to actually wake up early (!) and get things done.

The only downside is that my prescription has to be sent to me, which at times leaves me without having any at a given time.. because of mail delays, customs, alll that jazz … which is not a good feeling.

Would I be able to go to a GP and talk to them about already having been taking the medicine, discuss my problems with them and let them know how much it helps me, and get a prescription in the UK? It would certainly be much easier for me, but I am just thinking that a lot of people probably go in and ‘ask’ for these things. My Mom is a nurse so I have never had to really go about making these arrangements without her.