Class 1 is artics (new class c+e), class 2 is anything not including a heavy trailer (new class c)
7.5 ton is class c1
The new classes are explained better here.
http://www.direct.gov.uk/en/Motoring/DriverLicensing/WhatCanYouDriveAndYourObligations/DG_4022547
As for what a class 1 drive is, well I hope this helps.....
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