Costermonger a secret language, a code which only other costermongers understood. In her book, "Shadows of the Workhouse", Jennifer Worth observed that "Costers... spoke to each other almost entirely in back slang; incomprensible to an outsider." Many costermongers also used "rhyming slang"; where any word can be substituted with another word that rhymes with it. Examples of rhyming slang include: "tin lids" or "dustpan lids" for "kids"; "jimmy grant" for "emigrant"; "apple and pears" for "stairs"; "rubbidy dub" for "pub" and "trouble and strife" for "wife". The selection of rhyming words often suggested a symbolic association. For example, a "sorrowful tale"
Mick Carter of cockney rhyming slang and wanted to get as much "cockney-ness" into the role as he could. He said that his own use of slang was sometimes "too out there" for the show but he had tried to stop it being taken out. With the publication of the first photo of the entire Carter family together, "Heat" Olivia Cooke said she loves "the excellent way that Danny's character has been styled", adding that he looks "hot". Kirsty McCormack from the "Daily Express" said Dyer "looks like the ultimate East End hard man". Claire Hodgson from the "Daily Mirror" said Dyer