In the final application state, in the Updated information sheet, the CIC asks for photos with name of applicant and dependants written on back .. it also asks for application number
Is this application number that of the principal applicant and hence will be same for the dependants as well -- ? or are the CIC asking for the UCI, which is different for the principal applicant and his dependants ?
You have to write each individual's name on the back of their own photos along with the main application number which is same for all. Which means the application number that has been given to the Principal Applicant.