According to this website - www.londonpatriot.org - the BNP is aiming to find a candidate to stand in Hackney's Mayoral elections 2010.
The site is not officially BNP. In its "about us" section it says: "We are an independent site for London nationalists. We fully support and will promote the British National Party as we believe it is the only serious vehicle for the advancement of British Nationalism. However, any opinions expressed in posts or comments are those of the authors and not necessarily that of the British National Party."
I couldn't find any mention of the plan to stand in Hackney on the BNP's main website and I don't know if the BNP often stand in Hackney elections either.
According to Londonpatriot, a BNP spokesperson said the party needed money and candidates.