tried doing a speed test to check your ip profile? prolly stuck on 250kbps by the sounds of it maybe,
http://www.speedtester.bt.com/
type in phone number then your user name which is your mac address all in cap without the : parts, so something like 064843D185S4@skydsl
in ie not firefox, my firefox has probs with it but ie works fine, might have to retry a few times it gets busy.
seeing the 448 up speed looks like a sky "connect" package? if the ip profile is really stuck you'll need to keep the sync speed higher than what it is for up to 3 days before it will raise back up sometimes.
sky connect has been getting bad for about 4 weeks now, had my ip profile at 135kbps for 5 days couple of weeks ago ended up phoning them to fix it, "are the green lights on" blablabla yesyesyesyes. lately i keep an eye on the router and if i see that getting lower i unplug it for 30 mins or so and usually it re-connects back up normally withought getting that low sync event and getting a low profile again.
if it is that problem you can email the problem without going through the call centre,
http://mysky.sky.com/portal/site/skycom/skyhelpcentre/contactus/kana
enquiry;
i am having technical difficulties.
equipment
sky broadband box issue
then paste in the bt.speedtester info pointing out a stuck ip profile and hopefully
you'll get a mail back in around 24 hours with them saying they've put it forward
to the cst team, and they'll phone you in around 1-5 days, by which time it'll
prolly fix itself hopefully heh.
and don't get your kb and KB mixed up when pasting the info or you'll get a polite
lesson in bits and bytes, all low case kb from the speedtester site.
and another edit hehe,
some people have been speculating this might be a form of bt? throttling heavy connect
users going over their 40gig a month limit, or even if bt? see you d/l more than maybe 1.4gig
in a day and using a lot between 5pm and midnight.