What is N553D for?
No particular axe to grind on this, but what is advisory route N553D for? It runs from MAC to FYNER and seems to have been created in about 1995-6, but has no obvious purpose - how many flights are there between Inverness/Kinloss/Lossiemouth and Ireland? Was it perhaps put there to try to give some predictability for schedules between Glasgow and the islands against Nimrod traffic routing from Kinloss to Ireland & the SW approaches?
Contrast that with the withdrawal of the Newcastle-Carlisle section of W911D which has several scheduled CAT flights a day and crosses an area busy with military traffic.