Filming correctly, despite not knowing your edit suite inside out will always be superior to raking through the filters to brighten any video you produce. Why not have your back to the sun, but use a reflector? That way you can adjust the reflected light for the best. It needn't be an expensive reflector, though these are always superior, a large piece of white card can be angled to reflect onto critical framing of the shot.
Where the heck are you seeing sunshine? The UK seems to have been smothered in grey cloud for the last month