Self-seeded antirrhinum seedlings

I had lovely deep red/ magenta antirrhinums last year. They are self -seeding in most of my containers and looking strong and healthy . Is there anything I can do to help them survive until next year. I assume it's too late for them to flower this year. I don't have a greenhouse.
I'm inclined to leave them where they've decided to grow. Is that the best thing to do?

 

They survive well yr to yr down here, @BB3. I don't think London should be a problem. Just check under the leaves for rust in the autumn and remove any plants that are infected.

 

Thank yo @ViewAhead