I'm so glad you finally posted it! And I really enjoyed it, too. So many nice things, nice lines; I wish I were of Bigger Brain so I could mention some of them. But, just one line:
"Don't you mean 'What hasn't he done with Jack'? Otherwise we're going to be here 'til Thursday," Martha said.
Cracked me up. Also, Jack looking good in Scotland. Ha!

I really liked all the characterizations, and Gwen was so fun. Ianto's inner voice pleased me very much. The whole thing just made me sigh happily.