He'd be curious to know how that new screwdriver got assembled, and if there's a chance they could commission one, not that he expects there'd be a charge. Handy thing to have, really, and he would've never guessed when he first heard of the thing that he'd want one!
"It is absolutely fantastic!" He gives the coat-less Doctor a look, and then around to each of them. "I did, yeah. No, you weren't around for it since I couldn't track you down, and these two weren't born yet."
And speaking of all that time... He looks over to Rose as they're all heading over to the designated kitchen space, not that it's an actual separate kitchen. "Came to visit me, huh? Maybe it's a good chance for us to finally catch up."