14a Inactivity of MI6 station coming to the fore . ?t?s?s. Stasis fits and would be St then asis but can't see how MI6 gives us asis.
18d Excuses girl and boy pinching one shilling. ???s???s. No idea .
21d Old ass pulled up herb . O?e????. Think it's oregano. I can see o nag but where does ore come from? However if it is that then the o is the second letter of 29a
29a Order revolutionary books and articles from Helena would be
?o???n?n . I've got no idea what the reference to Helena is and Chambers Word Wizard doesn't come up with anything meaningful.