Caerphilly Castle is one of Wales's oldest and most iconic castles with its imposing walls, turrets and moat. And in March 2021, Caerphilly Castle was lit up yellow for National day of Reflection - remembering those who lost their lives to COVID-19 since the start of lockdown in March 2020. In the weeks leading up to National Day of Reflection, our engineers went to Caerphilly Castle, to remove their already existing and faulty lighting and replacing with new energy-efficient