No one has taken George Carey seriously since ... well, possibly ever.
No one even passingly familiar with the Church in the Marketplace these days could imagine his having anything to do with it.
But then, his Evangelical credentials were always overstated. He was really the most prominent of that type which is now slightly out of date, a sense in which he continues to exemplify it.
I refer to Liberal Protestants with Charismatic backgrounds, who assume that their own experience is theologically normative, and who work from there.
Ignore George Carey. Most people always did.