"in your area" billboards outside their franchise areas
The way that the cable franchise areas were originally set up led to large chunks not actually being allocated to a cable operator. Big digs and lots of civils work in the early 1990s meant they multitude of little cable companies could never pay back the expenditure, they slowly got merged into what became Virgin Media, who have had no major new network build-outs in their areas for about 16 years now.
If you are outside the old franchise areas, forget it. They're not coming, even if they erect enormous billboard adverts saying they are here.
I used to live in a franchise area, but they refused installation because my flat was more than five metres from the street junction. Now I live a hundred or so metres outside the old franchise area (as the crow flies, but no cable in the street). Again, no chance.
I knew this, but I still found time to waste the 25 minutes time of their salespeople replying to an addressed (to the property) flyer, and suggested they should only send such stuff out in streets that they have actually cabled.