Harry has played for Linfield in the reserves; his local club Coleraine; Doncaster Rovers; Stoke City and at the top of all that, Manchester United when he moved in December 1957. He was also capped by Northern Ireland 25 times. Not only was Harry the most sought after goalkeeper of his time but he was also the most expensive keeper costing £23,000. By comparison, the film the Bridge over the River Kwai grossed less than that at $27,200. Probably just over half of what Harry cost. Nowadays a top film will gross hundreds of millions. In 1958 Harry was voted the best goalkeeper of the World Cup 478 votes against Lev Yashin who had a mere 122 votes as his closest rival.

Harry bowed out of football in 1987 at the age of 55, returning home to the town of Portstewart as owner of the Windsor Hotel.