Okay rolled back the time machine and postcode used to be served by Yaxley 23 which is close or just outside exchange
Knowing which other postcodes 23 serves also gives an idea of possible cable routes and estimates would be in the region of 20 Mbps, so an infill to make more premises superfast hence cabinet 25 makes some sense i.e. suspect wiring went from exchange along broadway up London Road and turned into Brunel Drive. Estimates from BT Wholesale are a bit hit and miss so maybe area has some aluminium present.
In summary - the poster needs to email me at
[email protected] and remind me that this is the line still on Yaxley 23 when 25 is present. Need address and telephone number so that can raise with Openreach to get them to chase down - looks like a live to live migration has gone wrong or it is actually still to happen but checkers have already updated.