With a bumper musical programme comprising something new, something familiar, a star soloist and a big relatively neglected English choral piece ideal for the Albert Hall, the BBC Proms are back fully armed for the 75-concert summer season with a what was in many respects a classic First Night from the BBC Symphony Orchestra under their new chief conductor Sakari Oramo. A Finnish flag was waved in the arena to greet him, to which Oramo responded with a little wave.