Chaps,
It really gets on my nerves when someone tries to charge a landing fee for parking on a patch of grass. Here's a couple that are free (usually if you are using the facilities ; something as simple as a quick lunch will do)
DeVere Carden Park, Chester - Free
Holt Lodge, Holt, near Chester - Free
Rookery Hall, Nantwich - Free
Pear Tree Hotel, nr Droitwich - Free
Marriot Hanbury Manor, Hertfordshire - Free