As an experiment I just did a search for Flog It using the looking glass on the remote.
I put in "fl" and was offered Flog It as an option. Selecting that brought up a list of all the episodes (BBC2 and BBC2 HD) for the whole week ahead under the heading "Broadcast". Selecting one resulted in the same display as if I had selected it from the EPG.
Obviously, as Graham mentions, if it is more than a week ahead it will not find it because it is not yet in the EPG.