Only the paranoid survive is the current feeling in the Victoria Street Tory campaign HQ. Security experts have been called in to sweep the offices The Sun reports. Security is tightening. A casually dressed Guido, on a recent rare visit, was asked for additional proof of ID after passing through reception. The guard was blocking entry to the lifts in a meaningful way, by mistake Guido gave a Shadow Cabinet minister’s business card over to the security guard. The guard nodded and waved him through. Guido was not carrying barrels of gunpowder, but some extra work is clearly needed on the security front…