I've now had a look at the census scan, and the double line indicating a separate household is written between the Corkills and the Corletts. However someone started to write it in earlier, cutting off the 3 youngest children from the Corkill household, and then crossed it out. I think this has caused the confusion between the household at no.6 (Corkill) and the Corletts at no.8.

Sue