Broadband gone very slow

Question

Hi Normally we get 6.5mbps as a minimum buta couple of weeks ago this dropped down to 1meg. A fault was logged with BT and the helpful guy on the other end of the phone thought he could see a problem and handed over to the engineers.
Engineer came out just over a week ago, checked the internal wiring, found no issues, moved on the the green cabinet (20metres from the house) and then was going to check the exchange (<0.5 miles from the house). Never heard from him again but the connection speed improved vastly and we were even getting a little faster than the 6.5meg we normally got.
Today we're getting 1216kbps download and 332kbps upload. 332kbps upload is normal, but what is happening to the download speed?
home hub stats are as follows:
Connection information<script type="text/javascript">// createTable("normal", trClass, td1, td2); // </script>
Line state
Connected
Connection time
3 days, 22:24:00
Downstream
8,128 Kbps
Upstream
448 Kbps
ADSL settings<script type="text/javascript">// createTable("normal", trClass, td3, td4); // </script>
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.1
Latency type
Fast
Noise margin (Down/Up)
9.4 dB / 23.0 dB
Line attenuation (Down/Up)
10.0 dB / 8.0 dB
Output power (Down/Up)
15.8 dBm / 11.9 dBm
Loss of Framing (Local)
0
Loss of Signal (Local)
0
Loss of Power (Local)
0
FEC Errors (Down/Up)
0 / 0
CRC Errors (Down/Up)
1 / 2147480000
HEC Errors (Down/Up)
nil / 0
Error Seconds (Local)
1
Line state
Connected
Connection time
3 days, 22:17:30
Downstream
8,128 Kbps
Upstream
448 Kbps
ADSL settings<script type="text/javascript">// createTable("normal", trClass, td3, td4); // </script>
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.1
Latency type
Fast
Noise margin (Down/Up)
9.7 dB / 23.0 dB
Line attenuation (Down/Up)
10.0 dB / 8.0 dB
Output power (Down/Up)
15.8 dBm / 11.9 dBm
Loss of Framing (Local)
0
Loss of Signal (Local)
0
Loss of Power (Local)
0
FEC Errors (Down/Up)
0 / 0
CRC Errors (Down/Up)
1 / 2147480000
HEC Errors (Down/Up)
nil / 0
Error Seconds (Local)
1
Internet connection configuration
Connection information<script type="text/javascript"></script>
Connection time
3 days, 22:18:15
Data transmitted/received (MB)
199.18 / 6473.32
which begs another question: how come the datsa received is almost 6.5gig? It seems an awful lot of data in four days based on how much use we've had unless that figure includes BT Vision on demand stats?

Answer 1

The test kept failing for several attempts then eventually I got this result:
1. Best Effort Test: -provides background information.
Download  Speed
5736 Kbps
0 Kbps
7150 Kbps
Max Achievable Speed
 Download speedachieved during the test was - 5736 Kbps
 For your connection, the acceptable range of speeds is 600-7150 Kbps.
 IP Profile for your line is - 7150 Kbps
2. Assured Rate Test: -provides background information.
Download Speed
4768 Kbps
0 Kbps
600 Kbps
Max Achievable Speed
 Download speedachieved during the test was - 4768 Kbps
 For your connection, the acceptable range of speeds is 576-600 Kbps.
 Additional Information:
 Assured Rate IP profile on your line is - 600 Kbps
But now the problem has gone away because other speed test sites are reporting similar results.
What ever the problem it would seem to be intermittent