[James]

Christopher Biggins - Remember him mainly for the children's programme Rentaghost, and various celebrity panel and gameshows he did around that time. I didn't watch him on I'm a Celebrity... actually maybe I did now I think of it, because I remember he did a task with Janice Dickenson.
Chloe Khan - I recall some of the tabloid stories that appeared about her after she was on X Factor. I think she dated Wagner.
Grant Bovey - Years ago there were stories in the press about his relationship with presenter Anthea Turner. Know nothing of his personality.
Heavy D - I don't know him but I have watched the US version of Storage Wars, so can guess his personality.
James Whale - I used to watch his early 90s late-night ITV show, The James Whale Radio Show. I think it was on before club show Hitman and Her. Opinionated radio host.
Katie Waissel - watched the series of X Factor where she was a contestant. She might have been mentored by Cheryl Cole and claimed to have fallen out with her, or something like that.
Saira Khan - her and her rival Paul Torisi were my favourite contestants on the first UK series of The Apprentice. I haven't really watched any of her TV work since. Daytime shows I think. Sassy female so she will have a fanbase on TiBB.
Sam Fox - Famous in the 80s as a Page 3 (Sun newspaper) glamour model. Also had a number one record at the height of her fame.

I don't know the others.

I think if you surveyed the British public Sam Fox would probably be the most recognised housemate in the series.