Here is expert astrologer Steve Judd giving us a Mercury retrograde 2016 view from Britain:
A brief bio and a view of the natal horoscope of British PM David Cameron (of the tin ear!) shows his Sun @15Libra, Moon @6Leo, and Ascendant @1Libra, as Steve mentions. Interesting that Mr. Cameron has a Scorpio Mercury squaring Jupiter--one planet ruling communications and thinking processes while Jupiter plays many roles, one of which can be 'the politician'. A Mercury-Jupiter square denotes discrepancy between beliefs (Jupiter = how we relate to others) and the truth (Mercury) along with a tendency to be impulsive in judgments, decisions made before having all the facts (and thus being misinformed), questioning then changing answers that are inconvenient, and possibly being a pathological liar. Sounds like this square is quite useful in Politics. Especially the kind practiced today where decisions are not made--orders are taken from hidden bosses and 'special interests'.
Note that transit Mercury (Rx until Jan 25, 2016 at 4:50 pm est) conjoins power-mad Pluto in Capricorn twice more (until next year) on Jan 22 and Jan 30.
As for David Cameron, in the Harveys' Sun Sign-Moon Sign, there are two Images for Integration that may apply to PM Cameron based on his Sun Libra-Moon Leo personality blend. As you know, this describes the Sun (adult; conscious), Moon (child; unconscious) traits when they blend and work together:
"A performance of The importance of Being Earnest...A political idealist is crowned leader by adoring fans."
A play written by Oscar Wilde as an Image indicates that Wilde was also born under a Sun Libra-Moon Leo combination. As for 'adoring fans', I'm not so certain PM Cameron has retained them.