Yes I agree with you that they are all seem to be there for the job, not the exposure (-maybe with the possible exception of Matthew?) People like Sebastien, Ben (my favourite of the series), and Miriam don't come accross as wannabe TV stars, do they?
I'd forgotten quite how 'whiny' Adele was. And Saira, as much as I like her, came out with some funny "management speak" moments!!
Tim actually did quite well in that episode, I'd forgotten he was PM in the first task. I think my overall impression of Tim is tainted by the later episodes, in which I don't think he does perform as well - although I might change my mind watching it all back again...