Glasgow starlet Jackson was named in a 44-man squad for the three-day session at St Andrews, which begins on Monday.

The 21-year-old was a shock selection in former boss Frank Hadden's preliminary RBS 6 Nations squad.

But he was demoted back to the Under-20s before playing his part - under Robinson - in Scotland A's IRB Nations Cup win in June.

Jackson said: “I’m not saying I was disappointed or shocked when I didn’t get selected to start the Six Nations, but as a player you don’t go into squads thinking you’re just along for the ride.

“The ‘A’ tour was a good experience and the final was a step up in intensity, so it’s great to come back and find the coaches believe you did impress and want you in the full squad.

“But, when I get there I’ll be looking to show what I can do. Learn, of course, and listen and take on board everything I can. But you’ve got to push yourself hard too.”