Winsome

Dear All, One of my neighbours has put up a window/sunlight in his loft facing towards my property which was not approved in his plan and I have checked that on the planning portal. I am planning to put my own loft extension in a year or so where I will propose a window on that side. I already have obfuscated windows on the lower floors on that side. Does anyone thinks I will face any issues when I propose my planning application due to his loft window. Is there a time period or something after which his window cannot be challenged ? Any assistance will be highly appreciated and will help me deal with the situation amicably. Picture from my wide window on 1st floor also attached. Thanks, Winsome