An apocryphal story which might be based on a true incident:
In the early days of Trident autoland ops there was a requirement for all three flight deck crew members to carry a certificate in their licences authorising autoland ops to various limits (ILS Cat 1, 2, 3A, 3B).
So, this particular day, a T-bird is heading for LHR, where the weather is consistently below Cat 1 RVR. The crew discover that not only is the autopilot placarded for Cat 3 ops but all three of the pilots have Cat 3 certificates. Joy! They brief themselves for autoland and carefully rehearse procedures and call-outs.
On handover to London they are told 'maintain 350, join the hold at Lydd, delay not determined.' Assuming the stacks are full of aircraft waiting for the RVR to achieve Cat 1, the Trident crew play their trump card:
'We're Cat 3 qualified, we're requesting clearance to make an approach for an autoland.'
'Roger Bealine, but the RVR is now 700 metres and you're number 27 in the landing sequence.'