Lost cat, small male black cat missing

Hi, we last saw our cat on Friday 10th June, at lunchtime outside south harringay school. He followed us there and hasn't come home. He is black, approx 1 year old, fairly small and very friendly. His name is Dragon but he mostly responds to whistles. He's a much loved family pet and we'd very much appreciate hearing from you if you've seen him. He does not have a collar and is microchipped. Please call 07779716079 if you've seen him. Thank you.