Well, even taking those making the allegations at face value (i.e. that they had no state involvement) Panorama glossed over the fact that all, I think, are now involved in other far-right political groups. If I remember rightly, the phrase actually used by Panorama was "rival political group" (Hope Not Hate, could be described as a "rival" group, as could Searchlight) - which is deliberately ambiguous and encourages the audience to conclude that those spilling the beans did so as a result of seeing the error of their ways and out of revulsion at the BNP's politics. In actual fact, nothing could be further from the truth - most have ended up in groups that take the view that the BNP isn't fascist enough. This of itself is sufficient motivation for them to want to queer the BNP's pitch.