Collegium | Mark Duley, director SALVATOR MUNDI THOMAS TALLIS Salvator mundi O salutaris hostia PETER PHILIPS O crux splendidior RIHARDS DUBRA O crux ave ĒRIK EŠENVALDS O salutaris hostia EDWARD BAIRSTOW Let all mortal flesh keep silence HERBERT HOWELLS Psalm prelude De profundis Requiem   Collegium's programme for Good Friday explores themes associated with the…