Astonishing download speed?

[#1]

PlusNet May 13th
Date Download Speed Upload Speed
Today 03:07 13445 kbps (1.68MB/s) 367 kbps (45.9kB/s)
But
Server speedtest1.adslguide.org.uk
Date 13/05/08 03:10:02
Speed Down 3614.66 Kbps ( 3.5 Mbps )
Speed Up 378.65 Kbps ( 0.4 Mbps )
Port 8095
Link: http://www.thinkbroadband.com/speedtest/results/id/12106445557521226348.html

[#2]

Just a few minutes later:
Date Download Speed Upload Speed
Today 03:27 12123 kbps (1.52MB/s) 369 kbps (46.1kB/s)
Prior to my "post", the highest speed was per PlusNet: -
PlusNet May 11th
Date Download Speed Upload Speed
Today 09:36 8604 kbps (1.08MB/s) 370 kbps (46.3kB/s)
It can't be real?

[#3]

Speed Test Results
Date 13/05/08 09:07:44
Speed Down 5196.34 Kbps ( 5.1 Mbps )
Speed Up 369.27 Kbps ( 0.4 Mbps )
Port 8095
Server speedtest1.adslguide.org.uk

Did you forget a decimal point?

[#4]

Quote

(1.52MB/s)

Nope.  Sounds like the TBB speedtest having a moment.