If this is a swap to the new network then I would pay careful attention to your line speeds after the event. Also if you use the Think Broadband Broadband Quality Monitor, I would watch that carefully too.
There is a long lasting thread on the Plusnet forum where people on the new network have having issues with massive packet loss and has been ongoing for the last 3 weeks. There is currently no solution and Plusnet are still investigating.
One work around has been to get a static IP as this alters how your link is routed through Plusnet's networks.
So just make sure to keep an eye on your line.
The thread is https://community.plus.net/t5/Fibre-Broadband/High-p...