See above link - this story will probably have a very sad outcome. People have gone round putting up posters everywhere 1000 s of them way past Croydon . Unless taken by car/van there is no way she has left New Addington without being seen - The tram is the main route out and all the extensive CTV will have been checked also someone would have remembered seeing her.
How did the Mail know about the Grandmothers boyfriends colourful past -extensive google search /private detectives they use on stories or did the Police tell them. ?
37 year old ex-drug dealer Stuart Kelly , who did time for having a machete, originally had relationship with the girls mother,31 but is now in one with the girls 46 year old grandmother.