Alison's probably the most successful Big Brother contestant ever, are any of the others still around in the public eye? Most of them vanished quite quickly.
Adele Roberts, also from BB3, has a daily show on Radio 1.
The thing is Adele didn’t really arrive there from Big Brother. She was already a local radio presenter and spent years on the same station after her unremarkable stint in the house and although being on Big Brother probably helped her media CV her progression was more natural than “we’ve just signed your favourite reality star”. Kate Lawer arguably did better than Adele as a direct result of being on Big Brother, she’s not got the biggest profile now but still has constantly worked as a direct result of her appearance on the show. Of course the biggest star of that series would probably still be very much in the public eye had she not died.
You could also argue in some ways Brian Dowling was very successful but in a less consistent way.