In terms of people who I think are realistic candidates for the next two/three tears
Jermaine Jenas (a recognisable bbc face from spots and the one show)
Liam Payne or Louis Tomlinson (The 1D lads who unfortunately are almost verging on “has beens” their solo careers just haven’t been as successful as Harry or Niall.)
Joe Wicks (personally can’t stand the fella but he would be a different take on a social media star. Was surprised not to see him this year tbh)
Owian Evens (Getting his face about a bit more on bbc these days. Openly gay so a “box ticker” for equality. Drummer so would have rhythm
)
Nadiya Hussain (Not sure if SCD would go against her religious beliefs but I think she’d be a great and interesting signing)
A Drag Race uk contestant (I know a lot of people are iffy on drag queens but Courtney Act did DWTS Australia dancing with Joshua Keefe and did really well. I wouldn’t be surprised if one pops up soon)
I am struggling to think of potential female contestants none are coming to me and some more obvious candidates have said they wouldn’t do it (such as Fiona Bruce and I think Sarah millican has said she’s not interested)