We live on a naice 60s/70s-built estate, designed with pretty sweeping curves and open sight-lines. Houses on corners are not allowed to have their garden fence on the boundary between their property and the pavement. It has to be at least 1m inside their property. Similarly, sight lines are kept open by not allowing any high fences between front gardens, and no fences at the front of the gardens. Back garden fences are standard height. Low shrubs are allowed at property boundaries, as long as they do not constitute a solid barrier.
One house on a corner has, over the past 7-8 years, been planting tiny conifers along their property boundary, next to the pavement. Every year or two they plant another couple of conifers, nicely spaced apart. But the conifers planted 5-7y ago have obviously grown and are no longer tiny. More hedge-like.
It seems to me that they are trying to establish a hedge by stealth.
OTOH they aren't harming anyone, just enclosing their own property. OTOH one of the reasons this estate is so nice is the open appearance. Everyone knows the conditions when they buy.
Should I report them to the council?