I only offer these names and shows that eventually made it to air in case I'm forgetting other relevant pilots these hosts did:
Jack Clark: The Face is Familiar, Now You See It
Geoff Edwards: Your Number's Up*, Fun & Fortune
Tim Vincent: Chain Reaction, Pyramid
* = This one has been passed along for a while, but I can't find specific citation. Geoff mentioned Fun & Fortune in an interview.
-Jason