WATCH: National Express reveals previously unseen archive material ahead of 45th birthday

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These nostalgic images provide a trip down memory lane - charting the history of Britain's most famous coach company.

National Express turns 45 this year, and to celebrate the company has raided the archives and dug out a string of old photographs and marketing material.

A picture from the National Express archive

A picture from the National Express archive

The images give a fascinating insight into the origin of the much-loved brand.

Since the company launched, National Express coaches have clocked up a staggering 3.5 BILLION miles.