The front of Head Office was bricked up in the 1970s when, with the rise of the National Front (as a result of the anti working class measures such as wage restraints and cuts in benefits that the Labour governments of the time had been forced by capitalist conditions to impose), the SWP and the National Front were at war.
We risked being collateral damage as the NFers couldn’t tell the difference between us and the SWP. Some of their leaders could as we debated against the NF a couple of times before the SWP put a stop to that, preventing us demolishing the NF’s anti immigrant and racist views in front an audience of interested workers.