Conversation so far:
who has been on this is your life
Celebrities including Honor Blackman, Dora Bryan, Bob Monkhouse and Eamonn Andrews himself have appeared on the show This is Your Life.
who was the original host on this is your life
It was hosted by Eamonn Andrews from 1955 until 1964, and then from 1969 until his death in 1987 aged 64.
who was the host on this is your life after eamonn andrews
Michael Aspel then took up the role of host until the show ended in 2003. It briefly returned in 2007 as a one-off special presented by Trevor McDonald.
what happens on this is your life
In the show the host surprises a special guest, before taking them through their life with the assistance of the 'big red book'.

Question: what happened if a guest head about the project before the show
Self-contained rewrite: what happened if a guest head about the project before coming on this is your life