smithsax, Chambers gives i as a form of "in".
Filling in all the bars at the end was a drag and it seemed pointless, unless it makes it easier for the man in St Albans to check things.
I actually read a criticism of this puzzle on a certain other website; they who are usually so effusive in their praise! I thought it was OK but I wish there would be a hint somewhere if foreign words are needed. (Perhaps the 15-letter across solution is a hint.)