Tree overgrown and blocking light.

The trees have overgrown to the point they are way past the boundary, blocking light and housing hundreds of pigeons and other pest birds, resulting in pigeon dead bodies laying all over the ground, at my front door and needing picked up and disposed of. Not to mention blocking up the gutters, deficating all over windows, and blocking the footpath to a different houses and put again. Constantly getting scratched in the face or eyes unless clipping them back myself. They block out the light at night time and make it extremely dark. Branches half broke and hanging off at all angles. It may be private land but the landlord should be made to deal with the overgrowth. Its a hmo, with multiple tenants yet hasn't been trimmed in over a decade by anyone the landlord could employ. The tree is located in blenhiem walk/holyrood walk mixed street.