He travelled to Brussels from Ebbsfleet International station in Kent, but had chosen not to take his guide dog on the return journey.

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The app also includes travel planning tools to book a trip, destination guides, flight check-in, an interactive trip map and the "What's Next" feature to help guide customers to the next point in their journey.

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Creating your business plan at the beginning will help guide your vision and direction as you continue along you entrepreneurial journey.

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It has been designed as "a journey of discovery" for the user to give them a step-by-step guide to what might be influencing their mood swings, said lead researcher Dr Neal Lathia.

BBC: App taps phone and personal clues to your happiness