It's all about consent.
Without your consent they have no authority to enter into a contract for you to pay your TV License.
By throwing literature through this non-consenting persons door he has acted "Unlawfully" and could be accused of littering.
The occupier did not consent to have any literature left.
The TV License man had no option other than to to leave the premises.
Nice one Taffmaster Flash.
More on your right of consent can be read Here