Thank you, Ian.
My English skill is not good so hoping you get my meaning right…
Most narcissus bulbs usually start to initiate the roots in late September here. The temperature at that time here is min. 20-23°C and max. 25-30°C.
I'm not sure the plant is same as yours, Narcissus cantabricus foliosus is one of the earliest flowering petticoats here, too. My potted N. c. foliosus grown on sunny outside bench usually starts to flower in mid to late December. At that time, outside temperature is min. 3-5°C and max. 12-15°C.
I think many factors affect each other to flowering as your mentioning. But on the other hand, I cannot drop the idea about the petticoat daffodils - ‘early start, early flower’.
Here is a record of N. 'Craigton Chorister' on my outside bench
03/Sep bulbs arrived
06/Sep bulbs potted with dry compost, keeping at shade place
21/Sep start watering, still keeping in shade place
12/Oct a leaf pushed out from soil surface, moved to sunny place
…and a picture taken today. No flower buds can be seen yet.