By Jess Jones A former MI6 chief has sounded the alarm bells over what he calls a potentially calamitous takeover of The Telegraph by an Abu Dhabi-backed firm. Sir Richard Dearlove, who led the British Secret Intelligence Service from 1999 to 2004, said ministers should block the “completely unacceptable” takeover by the authoritarian state, which poses a “profound security concern” to the UK. The government should “put a peg in the ground and say no way”, Dearlove told The Sunday Telegraph. “It’s completely inappropriate for an autocratic state – even at arm’s length – to be the owner of The …