citified

I found out that train tickets are quite a bit cheaper when starting from the outskirts of London, a two hour bike ride from the centre; I'm tempted to try doing it

I agree that ads on ugly 10-lane highways don't really detract from anything, but this is not the case with the cities this organisation deals with. They are mostly historic, pedestrianised cities in England where (especially digital) advertising would be of serious detriment to the surroundings, which is what is being campaigned against here.