In the Part 2 account linked to by BatBoy, the blogger says that the excess internal fibre cable was carefully coiled inside the CSP. My question is this - how much excess can be coiled inside the CSP?
Once the outer sheathing is cut off, approx two metres are brought through to the front tray. This allows enough fibre to bring down to the cleaver and splicer, and the splice isn't always right first time, so has to be cut off and done again. It's basically enough slack to play with.
The reason I ask is because when I get round to ordering my FTTP, I'm thinking of asking for the 30m internal fibre even though the length required will only be about 3m (fed through a flexible conduit from the CSP to the point where the ONT will be mounted in a room above) - basically to allow for the possibilty of easily moving the ONT to a different location at some point in the future should the need arise by simply pulling the fibre cable (carefully!) through a different conduit.
I'm afraid the installer shouldn't/wouldn't agree to that. The ONTE will be fixed in an agreed location (this is recorded in the job closure notes) and the feed run and fixed from here to the CSP. Damaging this, and it is easier done that you might imagine, will result in Openreach (All together now.....) presenting you with a hefty bill for it's repair.
The answer I'd suggest, is to provide CAT6 from the ONTE to the router, this you can move anywhere or anyhow you want.