By Michael Holden and Sarah Mills LONDON (Reuters) – Britain will on Sunday salute the 70th anniversary of Queen Elizabeth II ascending the throne, but as the monarch celebrates another landmark, just how will her record-breaking reign be remembered? To some commentators, her reign has been a ‘golden age’, reminiscent of that of her namesake Elizabeth I who ruled over England 400 years ago in what is considered one of the country’s greatest periods. Others say the 95-year-old’s legacy is much less dramatic but nonetheless remarkable: ensuring the monarchy has survived in a time of huge social …