8mb broadband now won't go above 2mb

Question

This has been ongoing for five weeks now - I used to get regular speeds of well over 6mbps, now I only get 2mbps.  Time of day/night does not make any difference.
I've exchanged emails with customer services and the response has been useless - I question if they've even read what I've been telling them.  I have five PCs, a Mac, iPad and Galaxy S2 that use my network, and the speed issue affects all, so that rules out any hardware/software config problem at my end.  Also replaced the router, filter etc, and tested on a wired connection - no difference.  My phone socket looks like a really old one, with the old "T" BT logo on it with two dots for the top-right part of the T.
I've done a speed test at http://www.speedtest.btwholesale.com/ and that tells me the following
 Download speedachieved during the test was - 2.2 Mbps
 For your connection, the acceptable range of speeds is 0.4 Mbps-2 Mbps.
 Additional Information:
 Your DSL Connection Rate :8.13 Mbps(DOWN-STREAM), 0.45 Mbps(UP-STREAM)
 IP Profile for your line is - 2 Mbps
I've complained about the quality of customer service which I've received, and now BT are telling me they want to send an engineer out this Friday, BUT if they don't find a fault they're going to charge me £99 for it!!  I've been down that road before, at a previous address and it took THREE engineers before they found the fault AND BT tried charging me nearly £200 for the first two, who just hadn't done their job properly, so I don't have a lot of faith.
I'm >> << that close to telling BT where to shove their broadband and phone line.
I see a lot of people here being told their IP Profile needs resetting and from the above which shows my IP Profile is 2Mb, I'd assume that to be the case here too, but BT say not (spoke to them on the phone not ten minutes ago).
If anybody has any suggestions on this, I'm all ears.  Another week and I'll be off to another provider.
Dave
[edit] Oh, just to add - my router is straight into the main socket to the house (it's sat about three feet away from the socket), and there's nothing else connected except the BT Homehub 2.0, and my house phone.
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Answer 1

This (from the router) might be useful also.  Uptime is short because I was testing with another router, though the stats are fairly typical of what I've always seen there.
ADSL line status
Connection information
Line state
Connected
Connection time
0 days, 0:34:34
Downstream
8,128 Kbps
Upstream
448 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.1
Latency type
Fast
Noise margin (Down/Up)
7.4 dB / 21.0 dB
Line attenuation (Down/Up)
30.0 dB / 15.5 dB
Output power (Down/Up)
19.8 dBm / 12.1 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)
17 / N/A
HEC Errors (Down/Up)
N/A / 0
Error Seconds (Local)
15