Susan wrote:
I need to re-seed bare patches in my lawn, but I also need to weed, feed and
mosskill the lawn. Do I weed/feed/mosskill first and re-seed some time
later; or do I re-seed first and weed/feed/mosskill later?

The first way round. Tender young seedling grass does not like
weedkiller being applied to it for the first few months. It makes sense
to get rid of most broadleaved weeds before adding new grass seed.

Also spread a bit of the new grass seed out past the edges of the bare
patch or you could end up with a patch of distinctly "new" looking grass
that is obviously a different colour to the existing lawn.

Regards,
Martin Brown