Overnight the performance has gone back to normal
The speed as reported by Sam Knows has now gone back to 61.29 and Jitter levels are now back to .31
Looking back over the Broadband Quality monitor on this site during the period of very slow response the minimum latency graph (the yellow lines) were very prominent (and dominant) they dropped back to a very low figure at midnight last night.
So I do not know what Plusnet or Openreach have done - I would be interested to know.
Edited by DRW (Wed 01-May-13 08:16:25)