Iran makes 'substantial' nuclear offer in return for US lifting sanctions

* Plan would allow enhanced, permanent nuclear inspections * Foreign minister: ‘It’s not about photo ops. We want substance’Mohammad Javad Zarif at the UN on Thursday. He said: ‘If they [the Trump administration] are putting their money where their mouth is, they are going to do it.’ Photograph: Richard Drew/APIran has offered a deal with the US in which it would formally and permanently accept enhanced inspections of its nuclear programme, in return for the permane