Sweet peas can be sown in October and over-wintered - it's a traditional method of growing them.
http://www.thompson-morgan.com/info/articles/sowing-sweet-peas.html
You'll need to chip the seeds (scrape a bit of the outer seed coat off) and soak them overnight. I don't know about the others you mention.

Too late this year for sunflower and chilli. You can still sow carrots (you'll end up with small ones), Milan turnips, salad leaves, rocket and various other veg. Check out my last blog :-)

Probably still time for some radishes in a sunny spot. Maybe asparagus, overwintering onions, leaf chicory?

Broad beans are often planted in autumn.