This thread is seriously misguided IMO.
The Greens got fewer votes than the BNP last time.
The way to prevent a BNP candidate being elected would be not to vote for any party that is liable to do worse than the BNP.
This would mean in other words - don't vote for Libertas, Jury Team, the Greens, or in fact anything other than the Tories, Lib Dems, UKIP or Labour - in other words the parties that won seats last time.
As a matter of fact, supporters of those four parties switching their votes to the Greens are probably HELPING the BNP, by reducing the tally of votes for those parties.
In the last election the numbers were, roughly:
Labour 27%
Tory 24%
Lib Dem 16%
UKIP 12%
BNP 6%
Green 5%
plus others
There are 8 people to be elected.
Let's say the numbers this time look like this:
Tory 30%
Lib Dem 16%
Labour 15%
UKIP 12%
BNP 8%
Green 7% (let's say their natural support is 4%, but they get 1.5% from Labour and 1.5% from Lib Dem voters)
plus others
then the people elected are:
1st: Tory (now 15%)
2nd: Lib Dem (now 8%)
3rd: Labour (now 7.5%)
4th: UKIP (now 6%)
5th: Tory (now 10%)
6th: Tory (now 7.5%)
7th: Lib Dem (now 5 1/3%)
8th: BNP (now 4%)
What would have happened if the Labour and Lib Dem voters and voted for their usual parties? The BNP would have been kept out, and the 8th seat would have gone Labour.
The exact numbers are hard to calculate because there are so many possibilities. For instance are UKIP going to move up on 2004? Possibly, but the key point here is that if the BNP are in fact in danger of winning a seat here then the chances of UKIP scoring double their vote (it is a given that UKIP will take one seat - to take the second at the expense of the BNP implies a vote share double that of the BNP's) is tiny.
The correct voting choice for the anti-BNP voter could be Lib Dem, Labour (most likely to keep either party's vote more than double that of the BNP) or Tory (in this case more likely to be triple that of the BNP).
But it's unlikely to be Green.