Thanks Zarjaz, making sure I don't have to make untidy choices on the day is exactly what I want to avoid.
The cat 6 in the house uses the loft as a way of dropping down into two of the rooms while promoting domestic harmony
Most of the network fans up from the garage (I've almost got to the point of needing a patch panel, how sad is that!)
But the garage is on the other side of the hall from the NTE.
Pulling fibre into a roof space and down into the garage is probably a bit too much to ask an installer. I've just spotted the incoming copper in the external meter cupboard. A socket in there and cat 6 down from the roof space might be ideal if the fibre modem doesn't mind spiders
BJP