In the end, I decided to go on 10m WSPR this morning. I have been active since breakfast running 2W (20%) with the rest of the time on RX. As yet, no spots.
UPDATE 1024z: Some life!
UPDATE 1148z: Just local G spots of late on 10m WSPR.
UPDATE 1348z: No further spots, yet, on 10m WSPR. I wonder if the high Doppler on local spots is a result of aircraft approaching Lakenheath, Mildenhall or Cambridge?
UPDATE 1644z: No further spots all day on 10m WSPR.
UPDATE 1810z: With no further spots, I think I am going to QSY, maybe to 20m WSPR or 20m JT65.