Haaretz isn't providing an original story, nor is it providing any Israeli sources for the story. The Brits, no doubt, want to gain access to Israeli intelligence lost since the Mossad station chief in the UK was sent home. But they want to get a pound of Israeli flesh first if they can - thus, the planted British story.
Obama says world must reach climate deal in Paris 'while we still can' (Reuters)
from the article: UAE considered keeping Mabhouh hit under wraps, WikiLeaks cables reveal