Every seven years all non-exempt gifts are out of your estate and your nil rate band becomes fully available again (exempt gifts are immediately out of your estate). Therefore, you won’t pay inheritance tax on anything you gifted over seven years ago.
There will be IHT to pay on any non-exempt gifts made within seven years of your death as they will have used up some or all of your nil rate band. If a gift, alone or cumulatively, exceeds your nil rate band the recipient of the gift must pay IHT on the excess but the tax is reduced (taper relief) if you survive the gift by over 3 years.