I presume this might be Olympics related, my Plusnet Business Unlimited 80/20 connection:
Not seen it doing this previous evenings, but started to notice everything was getting a little less responsive, slower between page loads etc... Connection and speed still seems fine though and no problems with multiple BBC HD streams without any buffering, so if things are starting to get congested somewhere the signs of it aren't too obviously thankfully.
Ironic... Just as I clicked to post this the connection completely dropped, usually very reliable. Now on very flakey 3G
plusnet 80/20 FTTC
(and previously plusnet ADSL2+ Annex M Jan 2014-Mar 2015, Be* Jan 2009-Jan 2014, ZeN Dec 2006-Jan 2009, plusnet Aug 2004-Dec 2006, ZeN Apr 2003-Aug 2004)