From my wildflower picking childhood days around Attica (this activity was acceptable then), I remember cyclamen growing in conifer forests. In particular, I remember spotting them under pines, firs (Abies cephalonica) and Pistacia lentiscus. They liked to hide their beauty.
I have so far planted a few corms of C. hederifolium which have spread but nothing like your impressive success, Alisdair! I didn't realise it was as easy as scattering a few seeds and, perhaps, a dose of patience.
And I envy your collection of cyclamen, Trevor.