Last time I asked, parking a microlight at Glasgow was just 50p for two hours!
(It was during the ash cloud period, and there were no landing fees either!)
Before you get all excited, there were departure fees, navigation fees, handling agent fees and VAT - plus I think another fees just to collect the fees. Came to £140+ if I recall correct!
Maybe Sandown should charge a "handling fee" for motorgliders and the same landing fee as light aircraft ;-)