A no of things come to mind reading this.
1) As stomach-churning as it is, the BNP is a legitimate political party and the police should therefore investigate how that list came out in the open. However...
2) Apparently there are many on the list, soldiers, teachers, policemen, whose peers would not want to work with them if they were identified, neither would those whose care and protection depend on them.
3) Membership of the BNP, at least in the police force, is incompatible with the Race Relations Amendment Act, I don't know what similar laws exist with regards to the other services mentioned, but I think there are similar guidelines, so is it legitimate for the police to inform those concerned?
4) As for the Vicar concerned, what Bible does he, or she, read?