MG I find that overwintered chilli plants in the half light of my conservatory usually suffer aphids by January, then it’s touch and go whether they survive and watering the leaves outside does help.
Aphids like weak plants so I wonder if you have full light or decent ventilation?
This is the season for most aphids as they start breeding, while predators slowly build their populations thanks to having more aphids to eat, so things will improve soon.
