london british foreign secretary boris johnson say tuesday remark last week jail iranian-british aid worker could clear say want add credence iranian allegations nov. johnson say nazanin zaghari-ratcliffe teach people journalism arrest iran april 2016. uk government doubt holiday iran arrest last year sole purpose visit johnson say point disagree iranian view train journalists crime want lend credence iranian allegations mrs zaghari-ratcliffe engage activity say accept remark could clear respect glad provide clarification johnson say would travel iran come weeks discuss consular issue britain 's johnson seek clarify remark jail aid worker iran