It's not unique to the RNoAF! OC 5 Sqn Wg Cdr K*** at Binbrook made an in-advertant wheels up landing in an F3 in the early 80's. Quite spectacular and very lucky there was no fire after landing on the ventral.
The cause? Well, the SOP had been to raise the gear after every TO when doing circuits. This was changed to reduce wear on the UC being cycled. Habit got the better of the pilot downwind, selecting gear actually retracted the UC which had been left down after the last low approach and so the scene was set.....
It happened again earlier in April this year when a Typhoon FGR4, ZJ 943 coded "DK" of XI sqn which was on loan to 17 (R) sqn for weapons trials at China Lake air weapons station.
MB