So if you want to make a protest vote,you might want to avoid giving it to any of the following:
A Fair Deal for British People
British Homes for British Families
British Jobs for British Workers
Decent People Not Corrupt Politicians
End Afghan War Troops Home Now
Get Your Own Back
Putting Scottish People First
Scrap All Global Warming Hoax Taxes
Support Our Pensioners Support Our Troops
Support Our Troops Bring Them Home
With Nick Griffin Support Our Troops
See the Electoral Commission site for more details. It isn't actually illegal, just morally questionable deception.
There has also been at least one council election in which a candidate lied about his affiliation and got in as an independent while really a member of the BNP. Full story here.