BuzzieB, maybe better now to set your seeds next late Spring/early summer, that way they will grow on through the summer and be big enough to plant out in Oct/Nov time. They will then flower the following Spring.
Edited to add, thats what works for me.
My introduction to wallflowers was a plant I didn't recognise a few years ago that had self seeded in one of my tubs. I managed to ID it from a local village plant stall. Since then they have grown very happily in my tubs and self seeded in cracks in the pavement and at the base of brick walls.
They are a cheerful flower and add a lovely splash of colour in spring. What's not to like?
Perhaps worth a mention....be careful where you source your wallflowers from, as being a member of the brassica family it's possible to import club root into your garden.
Thank you for your diplomatic reminder Lyn will get the hang of seed growing, eventually