Charlie thought about it for a moment. "Don't mention the TARDIS or anything that comes after the year 1959, just in case it has an effect on my world and the timeline" he pointed out. It was a precaution and if it turned out that the portal had no effect on their worlds, they could part ways with safety guards and do as they pleased. But until then.
"Quickly put the uniform on" Charlie smirked. "And we can go" he added, waiting for the other boy.