In sporting parlance, the "dream-team" of countertenor Iestyn Davies and Richard Egarr at the harpsichord came together last night for a Wigmore Hall concert held to mark the 10 years directorship of John Gilhooly, and was the perfect representation of his decade at the helm: singer + harpsichord, immaculate programming, consummate musicianship, scholarship, unheard-of treasures, blended with a da