Is it the case that the nature of projects in the defence industry is such that companies are prone to consolidation into a few large contractors? In the case of pharma, given the length of time and billions needed to go from drug discovery to market means that only large companies can effectively do R&D. Is it similar for defence i.e., long development times mean only a few large companies can effectively compete? Or is the creation of oligopolies that don't allow for competition a very conscious aspect of government defence policy?