AnnieB is right. The link above that I posted (it gives a "North East Treatment Advisory Group" report) confirms this. There is no cost to the NHS for the drug itself for four weeks, so the first two-week trial has only the medical staff costs. While a MS Nurse could do the timed walk stuff, the final decision and prescription must be done by someone who is experienced in MS.
That answers johnh, since the average GP does not have enough experience to do it.
And, for patrick.b, I think (and hope as well) that Fampyra could also help with some of the muscle control that many of us have lost. His MuSmate looks like it helps bend his knee - which is something that FES is not so good at - as well as lifting his dropped foot . If Fampyra helps with flexing the knee as well, It could certainly make a difference to my walking. I am not suggesting that it could do away with the need for a stairlift, for example, but it could facilitate stair climbing and put off the need to spend big money.
Must deal with my Blue Badge renewal while I still have real problems .