NSW has recorded seven new locally transmitted COVID-19 cases and set another record for the number of tests done in a 24-hour period. Premier Gladys Berejiklian has cautioned Sydneysiders to “think twice” before going to Boxing Day sales in Sydney’s CBD because of concerns there may have been transmission there. The seven new cases identified in the 24 hours to 8pm on Christmas Eve are all connected to the northern beaches, and six were already in isolation, Premier Gladys Berejiklian said on December 25. Four cases are part of the Avalon cluster, bringing the total number of cases in it to 108. A further two live with another case, whose source of infection is still under investigation. Another case is still under investigation, but the person works in the northern beaches and has transport exposure. The cases were identified from almost 70,000 tests on Thursday, breaking Wednesday’s record of 61,084 …