"Oh, don't be such a prawn!" He rolls his eyes, arms crossed over his chest. "It doesn't help grow a TARDIS, it's not like it was designed for that purpose. It amplifies energy, organic and psychic energy. If someone didn't already know HOW to grow a TARDIS it would do them no good." He looks back at Ianto, "But it's true, that based on some of the things I found in that universe, there could just as well be similar things floating around here. We saw what Torchwood One did with what they'd 'recovered', I'm sure we'd both like to make sure that doesn't happen again."