Well spotted, Len. I'd never have found that without your clue with the 44 year old brother Robert. (note, for anyone else looking for them, Ancestry had them as "Calland" )

1851 West Derby, West Derby, district 1h, page 4
Mount Vernon St
John Callow (indexed Calland) head wid 50 artist b Douglas
Robert brother unm 44 shoe maker b Douglas

Now pull another rabbit out of the hat and find the family in 1841. Either Ancestry has done an even more amazingly bizarre transcription of Callow than usual, or the page is missing.

Jean C