Media reports are only so far saying that this will be held in West Sussex, at a "top secret" venue due to be revealed, perhaps, on Monday.
 http://www.wscountytimes.co.uk/news/Worlds-finance-chiefs-to-meet.5047702.jp
 http://www.brettonwoodsproject.org/art-563610
But it is well known locally that this is in fact South Lodge Hotel, in Brighton Road, Lower Beeding, near Horsham - a very up-market venue often used by the local business elite and police chiefs.
 http://www.southlodgehotel.co.uk
It is 40 miles south of London, 18 miles from Brighton and 5 miles from Horsham, situated on the A281.
 http://maps.google.co.uk/maps?hl=en&um=1&ie=UTF-8&cid=0,0,9407089623021974355&fb=1&split=1&gl=uk&dq=South+Lodge+Lower+Beeding&daddr=Brighton+Rd,+Lower+Beeding,+Horsham,+RH13+6PS&geocode=14988263817023798149,51.014658,-0.262035&ei=BAaxSZW0A-TCjAewjvzeBQ&sa=X&oi=local_result&resnum=1&ct=directions-to
Public transport: the 17 Stagecoach bus stops right next to it, at Crabtree, Lower Beeding. This is a 55-minute ride direct from Brighton city centre. Coming from London, travel from Victoria to Horshamy by train and then pick up the 17 bus towards Brighton from outside the train station.
 http://www.stagecoachbus.com/timetables/WG17timetable040109.pdf