>>>no one has said when this might happen...
There have been dozens of articles and news items about it over the past two years! (See Hopkirk's link from this February).
>>>the company listed is let's be clear at 800, i won't be contacting them at any rate
>>>i wondered whether the company i listed is some sort of fee paying enterprise
When the Government sold the licences to operate 4G services, it was known that some interference to terrestrial TV services might occur and, consequently, the phone companies (EE, Three, O2 and Vodafone) were required to fund a body to provide solutions,
free of charge, to TV viewers. It is that organisation which put a leaflet through your door, in order that it can carry out its function properly.
All you need to know is on their website:
https://at800.tv/