"Nuclear powers plan weapons spending spree, report finds," reads the headline. The 'leak' is intended to justify replacing the Trident System. Britain has undergone immense defense cuts, and whether the Trident should be replaced has been under debate for years. The single sentence mentioning Israel is just the penultimate boogyman used as a 'threat'.
Netanyahu orders more demolitions of terrorists' homes in attempt to crack down on terror (Haaretz)
from the article: Report: Israel seeking to upgrade its nuclear weapons capabilities