Self-storage operator Big Yellow Group announced progress on two major London projects on Monday, securing planning consent for a total of 307,000 square feet of storage space across two locations. The FTSE 250 firm said it received approval at appeal for a 176,000-square-foot development adjacent to the Kensington Olympia events centre, which was currently undergoing a £1.3bn redevelopment. It said the site would also be near what is set to be the largest theatre built in London since the 1970s. The new storage facility was slated for completion in 2027.…