Well, it certainly worked for one poster.
We tried another strategy when initially denied an epi.
When we got the anticipated denial (hospital was notorious), we said, ok we're going to be making a full complaint, time, place, request, and send it both the director of the Trust, head of Obs, Head of Midwifery and everyone else we can copy it to. A bit of aggro then ensued but....suddenly,we got the epi and like the OP it was fantastic,
Nothing like being supported in your choices though! That said the hospital we went to were really bad and I know most aren't like that.
Another trick to watch is that they don't remove the epi at the end so leaving you in unendurable pain when you most need it. Again, that was tried on.
I was then asked by the midwife if I had any regrets that I had not 'achieved' a 'normal' birth. 
I would have loved to have a worn an 'epidural and proud of it' t-shirt as I left.
Good luck!