Telstra 790S Aircard - Can I use this in the UK

 I know conventional wisdom is I should ask my carrier,, but they don't know the answer.  I have a Telstra 4G 790S Aircard, Which I have been satisfied with.  I am going to the UK for an extended stay, and would prefer to use the Aircard with a cradle, instead of buying a stick in the UK (I have my reasons).  I know I can get Aircard unlocked, although my retailer was not certain how this could be achieved, but there is another issue.  I belie the UK operates on a different band to the Aircard, and I suspect it is 'band' locked as well as 'carrier' locked. Does anyone know the answer please, and if so, how I go about getting band and carrier unlocked?  Thanks in advance.