[Originally posted as a comment at Of Course, I could be wrong]
While I am not without sympathy for those who cannot in conscience receive the priestly ministry of women (I am not among them myself), I remain unable to see why alternative episcopal oversight is necessary in a jurisdiction like England or Wales where women are not ordained to the episcopate. Unlike here, an English FiFer need only ensure that s/he receives the sacraments only from male priests. (Here, s/he would need to know the gender of the priest, his ordaining bishop, the bishop's ordaining bishop...)
The only arguments I have heard are rather fine-spun ecclesiological lines about how the FiF priests can't be in the collegiality of the presbyterate with female priests. In which case I would have thought it was time to leave your diocese and the Anglican Church, rather than associate only with a non-diocesan makeshift "presbyterium."