london foreign minister boris johnson say britain would appeal iran humanitarian ground free jail aid worker express reservations grant diplomatic protection would help secure release husband say wednesday nazanin zaghari-ratcliffe project manager thomson reuters foundation sentence five years prison convict iranian court plot overthrow clerical establishment deny charge johnson come pressure resign comment make early month zaghari-ratcliffe teach people journalism arrest april 2016. critics say comment might prompt iran extend sentence apologize remark monday thomson reuters foundation charity organization independent thomson reuters operate independently reuters news say zaghari-ratcliffe holiday teach journalism iran wednesday johnson meet husband richard ratcliffe tell britain would leave stone unturned bid free say british ambassador tehran early raise case iranian authorities johnson also stress importance appeal humanitarian ground ratcliffe tell reporters say positive meet officials question whether would help grant wife diplomatic protection move would explicitly make zaghari-ratcliffe fate issue state-to-state relations rather purely consular case legal opinion prepare human right charity redress zaghari-ratcliffe case say british government could grant diplomatic protection predominantly british citizen deny fair trial say think would important helpful ... foreign secretary foreign office express reservations ratcliffe say foreign office say lawyers would meet next fortnight discuss issue iran state news agency irna also signal move could backfire cite comment unidentified international law expert iran view zaghari iranian citizen try due illegal action convict iranian court serve sentence quote expert say hence uk interference peaceful paths humanitarian issue consider intervention iran naturally trigger iran severe reaction ratcliffe say johnson keen take trip iran plan end year could allow see wife three-year-old daughter care relatives iran first time 19 months important go trip stand alongside foreign secretary understand big ask reasonably unprecedented think important circumstances say ratcliffe say wife appear edge nervous breakdown due test find lump breast say think use diplomatic bargain chip fight nothing us ... use vehicle fight say uk 's johnson vow stone unturned free aid worker jail iran