His audience with the monarch marks a significant step in his campaign, which has attracted support from cross-party MPs, and anti-Iran protesters in the UK and overseas.The human rights activist, a native of Iran who has lived in Britain for the past 24 years, beamed as he set off for his royal meeting on Wednesday afternoon.Dressed in a suit and red tie, he appeared frail but upbeat as his wife pushed him in a wheelchair towards a waiting taxi.