I have the grid completed except for two clues - one of which should be thematic. Even with all the checkers I cant find words to fit.
Any hints - "Milton's brother..." and "Half the capital goes..."?
Re the perimeter, you can read the four parts starting at the top right or bottom right. If you want them in chronological order you need to start at the top right. In the original language and clockwise.
BTW as well as the 6 letter word that needs to be split, one of the two word solutions (the theme) has to be put in two places.