Over the last month or so we have noticed some issues with capacity on some of our Talk Talk back-haul. Staff have been working on efforts to rebalance this manually, but there are some signs of latency on some lines at some peak times. The is obviously not up to our usual standards, and we have ordered major upgrades to 10Gb/s links which are expected in a few weeks. We hope to announce more concrete dates in a planned work announcement soon.
At the end of last year we planned for these upgrades making our network ready for 10Gb/s links. We do forecasts on usage regularly and started trying to get these upgrades around 3 months ago, but it has taken a lot longer than expected.
There is more generally on this on my blog http://www.revk.uk/2016/10/to-ten-gigabits-and-beyond.html>/p>See planned work notice on upgrades