Non Material Amendment - Removal of chimneys from both dwellings of planning permission 5/2023/1490 dated 08/01/2024 for Two detached dwellings with habitable roofspace and integral garages, sub-division of plot and new vehicular crossing following demolition of existing detached dwelling and detached double garage at 7 Hammondswick Harpenden Hertfordshire AL5 2NR