Here's a map of post codes served by WNBUC cab 17, created using batchgeo.com mentioned in other threads, with data from the PCP spreadsheet of April 13th.
It looks as though cab 17 serves a great many properties. This is pure speculation on my part, but I wonder if BT are expecting a high take-up and need to do extra work, possibly adding cabinets. Perhaps some of the experts can comment.
An excellent use of the mapping tool that - and it shows quite a strung-out area for the one cabinet.
There are properties north of the A55 that are over 2km away, so I'd guess they aren't going to get a good VDSL service. If their service were being designed today, I guess there would be a separate cabinet up there...
The map also highlights a curious anomaly: the postcode CH1 2DN is ~7.5 miles away near the centre of Chester and includes a museum and a regimental headquarters near the Castle. I've no idea whether this is an error in the data used for the spreadsheet or reflects something real - and somewhat mysterious.
This map at Samknows shows the exchange coverage (click on the exchange, then click on "show/hide exchange coverage") - and that doesn't go into Chester. It is probably a fault in the spreadsheet data, rather than the geo-location of the postcode (which can also happen).
That coverage map, combined with your BatchGeo map, shows that cab 17 manages to cover the entire northern extremity of the exchange.
Edited by deleted (Tue 23-Aug-11 00:42:56)