Casting call time! Since they're looking for talent in the UK, I say take 'em all from a recent wildly successful English franchise:
Late-teen female, independent, good sense of humour, fit.
Young twenty-something male, witty and smart, fit but not traditionally good looking.
A late twentysomething male, fit, handsome and confident.
Seventy-something male, with strong opinions and tough demeanour. Also doesn’ t need to be particularly fit.
A second young female, also late teens, tough, smart and fit.
Forty something male, fit, military type.
Thirtysomething male, intellectual. Apparently doesn’t need to be fit.
Voila, instant classic.