You need to look at AD 1.1.
1 - IFR single engine departure minimum (claimed to be 1800 m in the thread)
AD 1.1.2 4.1
2 - The approach ban
AD 1.1.2 8 (and various ANO articles)
3 - The requirement for dual pilot (or autopilot/FD) on approaches with RVR < 800m (I think)
AD 1.1.2 4.4