Hi Paul,
I just wanted to be clear (maybe the initial reply was buried by the avalanche of replies to the code sense :-) but it's not ⌃> that does what you'd like the "closing bracket type-hit" to do, but rather ⌘⌥. (<- that period is part of the keystroke, not the end of the sentence). (<- this period is the end of the sentence)
I can't seem to get that shortcut to work, maybe I've somehow changed the settings when I was playing about!
Jump into your HTML bundle via the bundle editor. You should see a command entitled "Insert Close Tag".
Check to see that it's there and its scope (mine is empty/global) and Activation settings are correct.
Hope that helps, -steve