What do you mean by the drop wire?
Oh you mean the line into the house? well i was hoping it could be spliced into, so that they could do an external install into my PC room, so not replacing it.
When repositioning a master socket by an OR engineer it is often the better option to abandon all external and internal wiring and run a new cable from the pole to the new master socket position. I was very lucky in so much as when I had FTTC installed, this is what the OR engineer was prepared to do but then he wasn't a contractor. I personally call the piece of wire from the pole to the exterior of the property a drop wire, whether this is the right term to use, I wouldn't know.
I see that you would be happy to have the same rearrangement except to have a joint created at the end of the drop wire, abandoning all existing wiring and running new cabling to a master socket in a position desired. This is exactly what happened for my neighbour and that was a engineer from Kelly's!
However for my MIL, the installation engineer [Kelly] was not prepared to do anything other than to renew the master socket. I had to subsequently make the best out of a pigs ear. So what you would like and what you might eventually get, is very much a lottery. You can reduce the odds though by ordering the Data Extension Kit.