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.
In a short period of time, a new link road from Didcot to Milton Heights was named the A4130. At the same time, the previous route connecting Didcot to Harwell was downgraded to become the B4493.