Sometime during the 1970's, we suspect 1977 the traditional Blue and White Hoops changed as it was felt after nearly 80 years the hoops were more reflective of a rugby shirt than a running shirt and was replaced by two vertical blue lines on a plain white vest and a large 'D' was added. These vests remained the same until 2015 when the vests were tweaked slightly, removing the letter D and having the full name of the running club in the centre of the vest. You can see a mixture of the two running vests in the 2014-2015 section.
1971 - Northern Echo covers a piece about the Harriers and it's expanding athletes
Harriers presentation night 1978
Paul Harker in action at the Northern XC championships in Liverpool. Number 10, Frank Davies running for Liverpool Harriers but former Darlington Harrier who left the club in 1968 when he moved address. Frank held the Burtree Lane Harriers course record which was run every Christmas and Easter consisting of a 2.7mile loop which he did in 11mins48 which Paul managed to break in 1981 with a time of 11.42.