Foxglove help

I grew some digitalis purpurea from seed this year, sown in april/may I cant remember exactly when, but they've decided they went to start flowering now. Any ideas why, and how I can avoid this in future as I want summer blooms. Should I sow some now for next year or is it too late?
Thanks.
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The best time to start the seeds is when they would naturally drop them, which would be during mid to late summer. Not sure if sowing now would be ideal because we're into autumn. Sure someone will advise.
1. Sow them somewhere sunny and warm so they germinate earlier and grow faster, therefore flowering sooner.
2. Sow them into pots in a greenhouse or inside. This allows you to sow them earlier as the soil is warmer. You can then transfer them into the ground (still somewhere sunny).
I may sow some now and overwinter them in coldframe. Then sow some more in Jan/feb in coldframe and see what happens!