Hankering for a return to the good old days when Britain was Australia’s biggest export market as the Poms consumed imported Australian food, wore Australian wool and Earl’s Court was Kangaroo Valley? Forget it. Brexit is not going to do it for you. Even before Britain gave Australia and the rest of the Commonwealth the flick in 1973 (after a failed attempt to do so in 1961-62) by joining what was then the Common Market, the old relationship was on the skids.