As soon as he had a moment, Scotty - with his younger self in tow - nipped down to the transporter room to send his younger self off to Cardiff. And he was just grateful that he did have somewhere to send the kid, because otherwise he'd be stuck having to listen to complaints about not being allowed down to see the engine room all day. At least he was fairly certain the kid wouldn't be able to get himself in too much trouble in Cardiff. Might drive Jack and Ianto crazy with his attitude, which Scotty would have to make up to them later, but it was far better than risking the kid getting in an accident down in the engine room.
A couple minutes later, a tiny teenaged Scotty materialized in the tourist office at the Hub, and immediately started looking for things to poke around in.
A couple minutes later, a tiny teenaged Scotty materialized in the tourist office at the Hub, and immediately started looking for things to poke around in.