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You may be getting better upload than you think.
Upload speed is curiously variable according to details of line condition, software in use and target site. I have seen huge variations in upload test speeds, even though I have had almost completely consistent 16 or 17Mbps uploads using FileZilla to the SquirrelSave backup site. The worst test was the now defunct BT retail test that often gave 2 or 3 Mbps upload results against a reality of 17; but many others seem to suffer the same way to a smaller extent. Even the usually fairly reliable speedtest.net gave me a test below 7Mbps yesterday when BT Cloud managed 16 a few seconds later.
Below some speeds I measured with different sites soon after joining Infinity; details now out of date but ....
Try testing with BT Cloud. Make sure you use a directory of fairly large files (eg recent photos at a few meg each, or even a big video). You have a free subscription to that, and it now seems reasonably quick (after a very poor start). Be wary of using it as a backup service for now though: see various posts on http://community.bt.com/t5/Other-BB-Queries/bd-p/OtherBB
backup speeds (August 2012):
IDrive: 2700, rock solid
DropBox: 3200, but very irregular
GoogleDrive: 2400, slightly irregular
SquirrelSave: 7500 (after minor hiccup which was my fault), up to 8200. 17000 with WinSCP
I've tested using half a dozen speed test site and also doing uploads to known servers with high bandwidth, but issue was still that it didn't go above the 10meg. However have slved it now, looks like the hh3 needed a reboot, after which all the tests are now coming back between 16-18meg.
Looks like there may be an issue witht he hh3, as Jaseb41 had the same issue, and resolved it via a rreboot.
BT Wholesale speedtest asks you to confirm you have rebooted the router but it doesn't make it clear you should not reboot the modem.