Correction - there are no 25kmh speed limit signs (there's a 30 mph sign, and the history for the way has 30mph (e.g. my edit https://www.openstreetmap.org/changeset/44828512 with comment: "surveys of 03/09/2016, 17/09/2016, 12/11/2016, 27/11/2016, plus Bing, OS_OpenData_StreetView, and SAS")