Another broadband speed issue- please help

Question

My employer is a bb customer who uses this connection and also she is able to access email from her mobile when abroad, although i should think that this will have no effect on the download speed achieved on the home connection.
I have been asked by her to investigate the reason why the connection speed to a single pc at home is inexorably slow, it is almost akin to using the old dial up system.
I have carried out a number of speedtests using the BT speedtester, the result being the lowest download speed achieved at 79kbps and the highest speed achieved of 102kbps. 
There are no other pc's connected to the line, i have changed the asdl filter to no avail, so i would be grateful to anyone who can offer any help or a solution.
regards
cla

Answer 1

Thanks for the advice Hamish. These are the results.
ADSL line status
Connection Information
Line state
Connected
Connection time
0 days, 01:26:04
Downstream
160 Kbps
Upstream
448 Kbps
ADSL Settings
VPI/VCI
0/38
Type
PPPoA
Modulation
G.992.1 Annex A
Latency type
Interleaved
Noise margin (Down/Up)
12.6 dB / 16.0 dB
Line attenuation (Down/Up)
52.3 dB / 26.5 dB
Output power (Down/Up)
0.5 dBm / 1.4 dBm
Loss of Framing (Local/Remote)
0 / 0
Loss of Signal (Local/Remote)
0 / 0
Loss of Power (Local/Remote)
0 / 0
FEC Errors (Down/Up)
5927 / 3
CRC Errors (Down/Up)
31 / 0
HEC Errors (Down/Up)
10 / 1
Error Seconds (Local/Remote)
29 / 3
Download  Speed
79 Kbps
0 Kbps
250 Kbps
Max Achievable Speed
 Download speedachieved during the test was - 79 Kbps
 For your connection, the acceptable range of speeds is 50-250 Kbps.
 Additional Information:
 Your DSL Connection Rate :192 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
 IP Profile for your line is - 135 Kbps
Hope this will help
regards