After scarifying, now what?

I have just removed a huge amount of thatch from the lawn and was wondering what to do next? Is it too late to over seed? I am in the South East and it has been very mild. If not too late, what is the best technique to use, ie do I use topsoil? If too late, do I use an Autumn lawn feed? many thanks.
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I have never used autumn lawn feed before, so someone else may have experience.
I've never used autumn feeds either, but that might be an idea as I presume it would give the existing grass a small boost.