A famous (perhaps apocryphal) Trident tale: The chaps are inbound to LHR with METARs below Cat 1. They are pleased to discover that not only are all three cleared for autoland < Cat 1 (with certificates to prove it) but so is the autopilot (which was not always the case, depending on tech status). They brief themselves accordingly.
Checking in with London on handover they're told: 'Maintain FL 310 call entering the hold at Lydd.'
They play their masterstroke: 'London, Bealine 478, we're Cat 3 qualified and we're requesting descent for autoland.'
'Bealine 478, the RVR is now 700 metres and you're number 19 in the landing sequence.'