You cannot rely on OpenReach to use a cable which you have provided.
Why not run ducting from outside to where you want it inside with a pull cord inside it.
An OpenReach installer should be more than happy to use it.
BT Infinity 2 - IP profile 77 / 20 - super fast!
Previously BE Unlimited - 21,000 Download 1,200 Upload but then moved house - 6,500 Down, 1Mb/s up - gutted!
Ex <n>ildram , been to SKY MAX - 15,225 Download