You might get what you wish for and then someday the shoe on the other foot.

I'm writing from the States where within my lifetime, childhood so only the vaguest memories, it was the other way around. People who belonged to certain political organizations weren't just banned from government jobs but all sorts of other professions (including in the entertainment industry!). I did even experience a bit of the aftermath when in my teens parental disapproval if I went with this or that girl I was told was a "red diaper baby" (the mystery never spoken of; how would my mom know?).

In other words, the idea at first might seem like a good one but it's one hell of a dangerous path to go down. Not saying don't but am saying giove this one some real deep thought first.

By all means ban BNP, NF etc. But they are not the parties implementing the racist, anti-immigrant regime, are they? Nope, that is the Labour Party!

then think again. Some parts like the coop party are great & ica plus coop movement are know seemingly more powerful & sticking with labour as corporations expect a tory election win.
Alot ot them have supported the fight well against hardcore nazi fascism in 1930s spain& since despite new labour snafu& their more democratic than Rockefellers,stalin or Hiitler.

BNP clearly worse policy wise. However, Labour Party is in power and can therefore ACT on its racism, instead of just spouting about it. Immigration laws and deportations are a good indication of this.

We shouldn't call on the state to ban the BNP from the civil service, we should be agitating for the unions of the civil service (PCS, Unison, et al.) to take a more active approach in keeping the fascists from positions of power.

Workers organisation, not state empowerment is the answer. The same laws which banned fascist organisations' demonstrations were later used on any organised working-class force (be they trade unionists, communists, anarchists, unaligned, whatever) which threatened the state and the economic system.

The bourgeois state has a vested interest in keeping fascism marginalised, but not destroying it. It's their last line of defence against us (who they do want destroyed).