In today's Scotland on Sunday he talks to Jeff Connor about his reasons for making the move back to Scotland after three years in England. "My ambition was always to play for Scotland again. So I rang up Ian McGeechan and asked him what would be my chances if I came back north, and he said: 'Good'."
Cammy admits that he left Leeds with a few backward glances. He had become a firm favourite with the Headingley faithful and was playing his best rugby, picking up the players' and supporters' player of the year awards .
"Leeds are very honest side. There are no rampant egos there, and if you do have an ego, it is very quickly stamped out.
"I was sad at leaving, particularly after I played the last game and got those awards. It was great to feel I had the mutual respect of fellow players and the fans.
"But everything is new here in Glasgow, and it's exciting," Mather enthuses.
"I only read about what happened last year in the newspapers, but the fact they brought in Sean Lineen and Shade Munro with their enthusiasm, alongside Hugh Campbell, who I rate as one of the best technical coaches around, shows they are moving forward, and it's great to be part of it."
Glasgow's Graeme Morrison and Mark McMillan were in fine form as Scotland defeated England 33-22 to finish seventh in the Under-21 World Cup. McMillan weighed in with a try as Scotland beat England for the first time in nine Under-21 meetings.