Hold on Tight!
... that crew members had to sign non-disclosure agreements to stop them revealing that the Inside No. 9 episode "Hold on Tight!" was fake?
... that crew members had to sign <a href="./Non-disclosure_agreement" id="mwhw" rel="mw:WikiLink" title="Non-disclosure agreement">non-disclosure agreements</a> to stop them revealing that the <i id="mwiA"><a href="./Inside_No._9" id="mwiQ" rel="mw:WikiLink" title="Inside No. 9">Inside No. 9</a></i> episode "<b id="mwig"><a href="./Hold_on_Tight!_(Inside_No._9)" id="mwiw" rel="mw:WikiLink" title="Hold on Tight! (Inside No. 9)">Hold on Tight!</a></b>" was fake?