The postcode is a guesstimate based on averages of a few lines, in addition if you notice it refers to the following:
Quote:
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receive fixed 512Kbps or 256Kbps broadband service
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You aren't on a fixed service you are using ADSL Max.
The postcode check contradicts somewhat with regards to a fixed 1Mbps rate but 500kbps ADSL Max.
I think you are ok for the 1.472Mbps - just leave your line alone now and don't reboot it at all and your speeds should increase as BT's kit notices you are synched up at 1.472Mbps and are good for the 1Mbps line profile.
Go to the BT checker to see what your current IP Profile is, it was previously 500kbps and is probably the same and will remain that way until you are stable at 1.472Mbps for a little while.