Celebrity Traitors 2 cast: Who are this year's 'big dogs' and dark horses?

What happened
The reality TV game show returns on Thursday, with 21 stars vying to win £100,000 for their chosen charity.
Summary assembled by rule from the sources below

The reality TV game show returns on Thursday, with 21 stars vying to win £100,000 for their chosen charity.
Summary assembled by rule from the sources below