We should try and figure out the codes.
I've noticed around my way some Virgin Media work references are;
NK128LFFN-275
I've figured out that LFFN seems to be a reference to the Greater Manchester Local Full Fibre Network.
Not my area, but have a
tinsy bit of working knowledge on 'Noticing & Permits' with regard to creating them and displaying them on the streetworks set-up.
We use a system called EToN (Electronic Transfer of Notices) to raise a notice with the HA. The first set of letters and numbers relate to that particular orginsations unique code (in case of FPN's - Fixed Penalty Notices' being applied).
The bit in the middle I have no recall of its meaning, but would suggest it's an agreed 'simplified abbreviation' of intended works (The actual notice contains the work being done in finite detail). But I do know the final lot of letters/numbers are the Openreach estimate number relating to the job at hand and the HA own reference given to that job.
Each notice/permit should be 24 characters long in total, and it is that which should be displayed roadside when working. That's about the depth of my knowledge.