LaNDOWNERS can expect much higher rents from wind farm developments in future as demand for sites increase, according to a new report.  Consultants CKD Galbraith say that between 2002 and 2008, rents under new leases increased on average by 200 per cent.  In addition, from 2009 to 2010, rents rose by more than 10 per cent with early indications they will continue to increase this year as demand for available sites grows.  The firm has carried out advisory and consultancy work for private landowners, developers, community groups and statutory national bodies on over 850Mw of wind farms.  according to the report, landlords of pioneering wind farm sites throughout Scotland will soon be undertaking rent reviews on the earliest leases and evidence suggests they can expect significantly higher rental returns for thei