Harpsichord should be replaced with a organ and one or more theorbo. It is highly in doubt that Henry Purcell ever used 8'/4' choired type harpsichord to support continuo part for his trumpet composition. There are indeed Virginal (small & relatively inexpensive version of harpsichord) but these loud type harpsichords here were non existent throughout the époque of Sir William Byrd, Sir John Dowland, Sir John Blow, Sir Edward Stafford, Henry Purcell and his two brothers Sir.Thomas and Sir.Daniel Purcell, all held a royal positions in France, Denmark and England one or more times in their lives. I Suggest that the conductor resign from his post and should give up all harpsichord parts and get advises from Sir John Elliott Gardiner, William Christie, David Taylor, Konrad Junghanell and like to redo the work of Purcell. Those true gentlemen have great deal of knowledgeabout Purcell's work.