THE PHILHARMONIA ORCHESTRA IS COMING TO ST DAVID’S HALL   THE prestigious 2017/18 International Concert Series may be nearing a close, but there’s still time for a perfect penultimate performance from the Philharmonia Orchestra on Friday 18 May. Starting at 7.30pm at St David’s Hall, the orchestra is once again under the baton of the remarkable Vladimir Ashkenazy, who is joined by virtuoso violinist Pekka Kuusisto, the Crouch End Festival Chorus and a military band featuring musicians from the Royal…