Battersea
It's not exactly a perfect location, and requires a half hour drive for the PAX, but I've been flying my director into Southend Airport. Got a contact there whose an a familiar person with most people up north who does a sterling job of arranging handling, refuel and vehicle transport into London in double quick time. Landing fee's are a hell of a lot less than Battersea. If anyone wants any details PM me and I'll pass you his contact details.