I hope that one or two of you may be able to be at St John's Church, Leytonstone (quite near Leytonstone station, Central Line). London Gala Orchestra includes Hipocondrie by Zelenka in t heir 30 November concert starting at 7.30 pm.
I believe that you will get more details of this partly Vivaldi Flute Concerto concert from the following website
Andrew Hinds