I used to listen to "Belle and Sebastian" (a Scottish indie-pop band) quite a lot.
In one of their songs the lyrics goes:
What does it mean to be faultless to a 'T'?You think I'm faultless to a 'T'
My manner set impeccably
But underneath I am the same as you
Though I am not sure, I guess it's British slang of some sort.
BTW, The song is named: Too much love.