We don't all have the time or capacity to become experts. Most of us know a little about a lot of stuff and would like to listen to experts before deciding, so how are experts identified and who should we listen to?
The following brief talk about the Koran may illustrate the point: Lesley Hazleton was "approved" by TED to give a short (10 min.) talk; their website provides some background about her; her talk explains the research that she has done and touches on her relevant experience; and what she says may be corroborated if you want to look into it. These are the sorts of ingredients needed to trust an expert.
The Interactive Democracy model should allow MPs, from both sides of The House, to recommend experts, giving them "air time" on the ID website. Voters, debating the point on the same site, may also point to other experts other publications.