"Did the awarding by Shell to P&O of a national contract to deliver its petroleum throughout the UK amount to a transfer to P&O of that part of Initial's business, which was dedicated to the provision of 'back up' delivery services in the North West and Scotland. In particular was Initial's contract with Shell an undertaking or discrete economic entity; and if so, was the undertaking transferred so that it retained its identity in the hands of the transferee – P&O."