Ah right yes I remember seeing that somewhere else. I will look out for it when this has happened and if I don't get to ask .
Like I said via PM, the following could either be a complete removal resulting in no fibre, or it could be a relocation closer to the PCP cabinet.
Location: (PCP33), NGA RELATED WORKS, SIDE OF H S S Hire Group plc 372 Chepstow Road ON HAWARDEN ROAD.
Description: Remove Cabinet and base (NGA cabinets).
I to be honest think its probably going to be the second, the reason for this thinking is if they have already laid the fibre and the cabinet was ready to go live then BTOR would loose huge amounts of money for the fibre that has already been laid, and relocating the fibre cabinet closer to the PCP cabinet would just require a new short length of fibre from the pit/chamber on the corner of the road up to the new location of the fibre cabinet.
As for keeping a look out for "install poly duct etc" message on roadworks you may have a rather long wait, the work to remove the cabinet and base is due to start the end of the month, and asking for planning permission to dig up the pavement etc can take a while.
But saying that, it has been known in small occasions for BT to run things side by side where they may install the new cabinet before the old one has been removed.