Last I heard.....
"The owner of a piece of land does not need special permission to use it as a Helicopter Landing Site provided certain conditions are met. Naturally, it must not be in a congested area, otherwise you will come up against the ANO. It must also be only for private or business use, that of any employees, or people specifically visiting for social or business purposes. Finally, no structure must be erected in connection with its use for helicopters, aside from temporary ones (such as windsocks), otherwise the Planning Permission (Zoning) people will become interested—there's no need to notify them of anything unless the land is to be used as a helipad on more than 28 days in any year. In fact, current planning regulations allow a helicopter to be used for personal, business and leisure uses “as many people use a private car” from the owner’s dwelling house without limitation, making it exempt from planning control, provided the use is incidental, or ancillary to, the principal use of the land. Also, the local police should be informed, as well as the other emergency services, especially where the public would normally have a right-of-way (such as a park)."
Cheers
Phil