A few years later, a new link road was built from Didcot to Milton Heights and became the A4130. The old route between Didcot and Harwell was then downgraded to become the B4493.
A few years after that, a new link road linking Didcot and Milton Heights was designated as the A4130. Simultaneously, the old path between Didcot and Harwell was reclassified as the B4493.