I've been mapping the cabinets in our area, and I've noticed what can only be loads of mistakes in the data.
If you look at this map http://batchgeo.com/map/d40765292120b6f48e0cfebb9589...
then you'll see that cabinet P25 has postcodes spread out all over Ramsgate, click the cabinet number at the bottom of the map to highlight that group.
Also cabinet P46 has one quite some distance away.
These are not the only ones I've noticed, I've seen it with loads of others, also postcodes that the mapping software doesn't recognise, and some of these unknown postcodes I've tried on the Post Office postcode checker, and it doesn't recognise them either, such as this one CT12 5FB.
Surely these must be errors, why runs lines from cabinets a long way away, when there are many other cabinets closer??
If these are errors, then it doesn't bode well for the data that Openreach is using, I've already seen one complaint on a BT forum where somebody was told they could get Fibre and then when the engineer turned up he discovered they were connected to a different cabinet altogether and could not get Fibre. They were told that the data had not been updated when they moved house and took the number with them.