At about 1925z I QSYed from 10m down to 630m (472kHz) WSPR. I shall be on 472kHz WSPR for the evening and night with 5mW ERP from the earth-electrode "antenna" in the ground. I am on RX 80% of the time.
UPDATE 1940z: I see that G0LRD (25km) spotted me strongly on 472kHz WSPR.
UPDATE 2200z: It helps to have the "upload spots" box ticked! I was wondering why WSPRnet had others spotting me but I was, apparently, not spotting anyone. Then the penny dropped. Doh.