Clyde would certainly be in line for Torchwood recruitment. In my head, Luke shall one day be UNIT's scientific adviser, Clyde head of Torchwood and Maria after retiring from companioning runs a freelance defending of the Earth operation from her attic.

Maybe they're filling in the gap of New Who during the specials. It'd be awesome if get put in New Who's timeslot. And SJA really is turning into a Classic series's natural successor, you'd have that many episodes in a run of Classic Who.

And there's nothing like a bit of jealousy to kick a characters butt enough to get them to act. Well, that's my hope anyway with Alan.