Marlborough is a market town and civil parish in the English county of Wiltshire on the Old Bath Road, the old main road from London to Bath. The town is on the River Kennet, 24 miles (39 km) north of Salisbury and 10 miles (16 km) southeast of Swindon.

The A4 is a major road in England from Central London to Avonmouth via Heathrow Airport, Reading, Bath and Bristol. It is historically known as the Bath Road with newer sections including the Great West Road and Portway. The road was once the main route from London to Bath, Bristol and the west of England and formed, after the A40, the second main western artery from London.