Visits by English Touring Opera are always to be looked forward to, but this autumn it has surpassed itself with three baroque works, two of them masterpieces and the third a fascinating rarity, all performed by casts of astonishingly high calibre, and produced helpfully, resourcefully, with simple elegant sets, which are all that is needed, though they probably cost a thousandth as much as the eye-catching splurges that we often see in London.