OK, that shows why you are only getting under 1Mbps. The IP Profile is what determines your actual maximum speed.
With your 1728kbps the IP profile should be 1.5Mbps. This updates using an automatic system, and can take up to 5 days of line stability. It is probable something happened last week that caused the drop, and the reboot that yarwell asked for gave you the 1728 figure. So later this week your speed should come back to between 1 and 1.5Mbps.
I've got a fuller explanation on this page
. It is headed "Old" because there is a newer one for ADSL2+ exchanges, but you are on the original.
What we don't know is what happened to cause the drop in the first place. Watch out for it happening again and see if you can think of anything around the same time. Thunderstorms for instance. Powered exercise bikes and treadmills in use, possibly next door.
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Plusnet Value Fibre.
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