I have painted the walls of my hallway and when I look at the paint from either end of the hallway I can see roller marks and patchiness, even though I cannot see them when I stand in front of the walls. I applied the paint correctly so is this a paint issue?
The effect you describe is called ‘glancing light’. This occurs when light glances off the walls, which highlights imperfections which would normally not be noticeable. To address this, apply two coats of British Paints Clean & Protect Matt, as low gloss finishes reflect less light.