I have had a go at cleaning the sensor. Looking at the face of the sensor surface there appeared to be only visable "using a x4 magnifier" three significant blemishes.
Blowing with an air duster had no affect in removing the dirt.
Moistening a chamois leather 10mm wide wipe and very gently "stroking" the sensor surface has improved the captures to my satisfaction. I have attached the results with the resulting capture.
Without you suggestions MB & Gainfull I would not have suspected the sensor
cleanliness.
Regards Brian
