We have a previous thread about the academic visitor visa:
http://chronicle.com/forums/index.php/topic,67652.0.htmlIf you're turned down for the academic visitor visa, you can still apply for a general visa to come to the UK, but your stay is limited to only six months in any one year period. Trying the "go home for a month and then come back" routine will not be looked on kindly by the UKBA, and a refused entry stamp in your passport will severely limit further travel to this side of the pond.