What's the point of an Archbishop?

Interesting to note that BBC Radio 4 ran a programme this morning, "What's the point of the Archbishop of Canterbury?" It was the first in a weekly series. I don't know when it was recorded, and whether it was subsequent to the media fiasco over his lecture. It was depressing to hear vox pop interviews on the streets of Manchester where people were asked if they could identify his face on a photograph and they were saying things like "Isn't that the church bloke that thinks we should have shari'a law in Britain?"

Couldn't hear the whole programme, but it seemed to be grinding (in a grudging sort of way) towards an appreciation of the role.