It’s milestones all round for the Newbury Spring Festival this year which celebrates its 45th anniversary, its festival’s chorus‘ 25th and Sheepdrove Piano Competition its 15th. Arts Editor TRISH LEE takes a look back through the years. IT’S a year to celebrate for festival lovers, commemorating 45 years of the town’s highly-successful international musical fortnight as well as two more milestones. It has been 25 years since the first Festival Chorus, and 15 years since the introduction of the Sheepdrove Piano Competition. The idea for an arts festival for Newbury had its roots in a gala conce…