I have one that is still laying this year so far.Many young pullets that started to lay their first egg in spring keep laying in their second winter.
Are they gloomy overcast days? I think it is the quality of light more than temperature.If the weather is cold/bad (around 0C), they don’t start until march. Heath
As for quality of eggs, my older girls really do not have the quality eggs my younger girls do, I bake with them. I don’t have bantams, just full size barn yard mix.