@ Tickmike I expect that the areas mentioned will have an identical point-to-point local fibre distribution from a master cabinet with 10 Gig * 40 channels DWDM dark fibre pair to the nearest data centres where B4RN have carrier-grade Juniper equipment. I believe that now includes Edinburgh, Manchester and Telehouse North in London Docklands with peering facilities providing quite robust dual diverse routes for many of B4RN's village cabinets. However there will be some village cabinets with dual 10 Gig feeds in the same cable at present and a few cabinets where additional wavelengths are active as B4RN upgrade their capacity once the peak load has been observed at over 50%. Every core route fibre cable services the local properties and has ample fibre capacity to provide the feeds to adjacent villages. (You may recall that B4RN started with just 8 parishes but has now "exploded" to well over 50 without any significant difficulty.) When I last counted the B4RN area extends over parts (excluding large conurbations) of over 20 exchange areas but currently without any involvement with them.
