By Isla Binnie, Andres Gonzalez and Pamela Barbaglia LONDON (Reuters) – Spain’s Ferrovial is looking at options for its 25% stake in London’s Heathrow, two sources told Reuters, and has held preliminary talks with external advisers on the future of its holding in Britain’s biggest airport. The early stage discussions come amid interest in Ferrovial’s stake from private equity firm Ardian, which has held talks with its own advisers on a possible joint proposal with Saudi Arabia’s Public Investment Fund (PIF), these sources and another person familiar with the matter said. Ferrovial has yet to t…
