The strategy presentation, which will be repeated in New York, is seen as crucial to the reputation of new chief executive Phil Watts, who has had a bumpy start in the post. The shares have fallen 30% in six months, leaving the company in danger of being replaced by BP as the world's second-biggest oil company. Shell, which has won accolades for its success in slicing $5bn from its costs since 1998, said further reductions would add £500m a year to pre-tax profit over the next two years.