QUAGRAINE v. ADAMS Licence—Revocation—Grant of land—Q authorising A to start construction of building on land pending conveyance of land to  A—Whether constituting licence for A to enter land for purpose of building—Whether licensee committing trespass on entering and remaining on land for agreed purpose even if licence gratuitous—Licence valid until revoked—Licensee entitled to reasonable notice to remove self and property on revocation—Licence granted for erection of building—Limitation on compliance with revocation of licence.