From their main advert for Broadband Premier...
Quote:
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Broadband Premier comes at the fastest speed possible, up to 2Mb. If 2Mb is not available to you we will provide you with broadband at 1Mb or 512k.
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So it is both "up to" and "if" you can get, and this is exactly the same as almost all ADSL based providers using BT's home products. Even BT say the same.
Chances are if you are on 512kbps then you'd have the same even with BT.
Do you know for certain the exchange has been upgraded to 2Mbps? Could be the line you've got is on the waiting list for the 2Mbps upgrade from BT as not everyone has been upgraded yet. Have you asked PlusNet about it? They can push through an upgrade early for a fee (£14.99 ) and investigate any problems. They have a very nice online customer support system (unlike a certain ISP we know well).
Could be you are too far from the exchange (in line length, not as the crow flies).