one of the roads off the cov road is now having big holes dug up next to each lampost
I think you might be optimistic in thinking this is related to fibre.
Birmingham are also upgrading Street Lighting to more energy efficient ones.
Holes next to each lampost may be related to this.
My understanding during the FTTC installs, is that BT install a new green cabinet next to the existing cabinet, dig a trench for power and a trench to the nearest BT hole in the ground laying trunking for each.
So fibre comes from the exchange through existing trunking to the hole and then off to the FTTC.
Course I could be completely wrong.
But I think the fact that there are holes by each lamppost, suggesting it's a lighting upgrade you see there.
Simon