a notice on the property is friendlier to the owner as opposed to a charge and also cheaper to administer , basically if the property is going to change hands then you are notified , you have a contract with the current owner which gives them rights to use the free electric and in return you recieve free use of the roof for a predetermined period ( the 25 year fit term ) in the contract there are penalties for early removal of the installation and access rights the same as your local electricity board has with your meter . if the new owner doesnt want the panels on the roof the old owner can refuse to sell to the new but the contract says the new owner has to accept the old contract else liquidated damages will apply so its just a case of writing to the purchasers solicitor and cashing in the option if new owner wants to remove the panels or not take over the liabilities of the contract ( the proceeds are deducted from any profit made on sale of house and sent directly to you) here endeth todays lesson