This has got to be one of the most challenging, interesting, influential and professionally-fulfilling senior communication jobs around, arguably anywhere in world right now. The British government is advertising for a Director of Digital Engagement, a new role in the Cabinet Office at the very heart of central government. Whoever secures this role will, in the words of the ad, be expected to “develop a strategy and implementation plan for extending digital engagement across Government.” That simplistic phrase belies the…