Glued and screwed an ash repair section into window frame upright between N/S w5 and w6. Removed as many of the remaining rusted screws and nails in the exposed framework around N/S w5 and w6. Filled some oversize screw holes with hardwood toothpicks and PVA.
Ordered some grey enamel for the timber framing from Regal paints, which I thought was most appropriate and much cheaper than anyone else.
I changed to using hardwood dowels to repair screw holes and then (later) Titebond instead of PVA although these early repairs were actually fine when I came to reinstall the windows. On later frame repairs I removed the screws once the glue had cured and replaced them with dowels.