Got same response on Virgin Forum - ie. that it is to do with the Superhub 2 firmware, which is due to be updated.
Are there any decent alternatives to the Superhub 2 that might provide the solution to the latency spikes?
P.S.
The max latency is still really high today:
These are some ping results for BBC and Google: as you can see no packet loss, and average latency is good. It is those spikes which concern me though -
Ping statistics for 212.58.253.67:
Packets: Sent = 6861, Received = 6861, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 16ms, Maximum = 2380ms, Average = 20ms
Ping statistics for 62.253.3.123:
Packets: Sent = 6909, Received = 6909, Lost = 0 (0% loss)
Approximate round trip times in milli-seconds:
Minimum = 7ms, Maximum = 2120ms, Average = 11ms
Edited by deleted (Sat 07-Sep-13 14:44:32)