The Cranwell Hawk gear-up landing was at the end of an airtest/transit. During a Hawk Full Airtest the gear has to be operated from both cockpits. The front cockpit has the usual 'Up' and 'Down' buttons, as does the rear selector, but the latter also has a 'Front' button. With the 'Front' button depressed the front cockpit has control of the gear - normal Ops. If the rear operator selects either the 'Up' or 'Down' button, the gear travels accordingly and the front cockpit selector is inhibited. Rear seat QFI has final say, but for normal ops he always had 'Front' depressed and asked the front seater to select accordingly.
So, if the rear operator does a 'Down' then 'Up' selection from the rear the gear will operate as advertised from the rear cockpit. If he forgets to reselect the 'Front' button, the guy in the front can fly his VRIAB, press his 'Down' button and try to land, but the gear stays up. If one fails to use LOI (Indication!) and check for the greens then a wheels up landing is inevitable.
It happened at least once before (Church Fenton?) and was a well known and highlighted 'gotcha' of using the rear gear selector. I'm sure it was a very early speculative post after the Cranwell accident but not one anyone could hide from post-flight, the ADR and cockpit selectors give it away.