Just to narrow it down a bit more, North or South Manc? as they use different proxys, North uses the manc proxies and south uses bagu.
Have a look at this
http://www.cableforum.co.uk/board/sh...ad.php?t=20815 thread for North area. Also take a peek into this
http://www.cableforum.co.uk/board/forumdisplay.php?f=31 sub forum for proxy and email related issues.
I personally am in South Area and at the moment

am enjoying for some reason no proxy. Like you I use both IE and firefox, though not in any particular prefence, through a Samsung via a DL 614+ router and find by using the Simple Speed Test at Robins site regualrly (sp) get around my specified speed.
Mon, 13 Dec 2004 13:31:53 GMT
1st 128K took 719 ms = 182298 Bytes/sec = approx 1517 kbits/sec
2nd 128K took 703 ms = 186447 Bytes/sec = approx 1551 kbits/sec
3rd 128K took 719 ms = 182298 Bytes/sec = approx 1517 kbits/sec
4th 128K took 718 ms = 182552 Bytes/sec = approx 1519 kbits/sec
Have a look at the thread
http://www.cableforum.co.uk/board/sh...ad.php?t=20977 and check to see if you are being routed through a transparent proxy