As the other FTTPoD threads are now quite long, and as suggested by candlerb, here's a thread for posting the results of a full survey as compared to the original desktop quote for FTTPoD.
To kick the thread off, I applied in March for a quote via Cerberus. I live in a rural location, around 200m from the nearest cabinet but just under a mile from the exchange. As far as I can tell, most of the route from the exchange to the cabinet is underground, with overhead lines and poles from the cabinet to the surrounding houses (including mine).
I don't know where the aggregation node is.
I was quoted £13,600+VAT by the desktop survey. I've been waiting since for an engineer appointment to be made, but out of the blue I had an email earlier today saying:
"Your estimated build charge was in excess of £13,600.00 + VAT. The confirmed build charge is £3,342.67 + VAT."
That isn't a typo - it's around £10,000 less than the quote! I've asked for confirmation that it's the correct amount. After all, I haven't seen an engineer - they could have come when I was at work, though, and as the connection comes in from a pole, runs down my wall and into the dining room it perhaps doesn't need anyone to see inside the house.
I'll update the post if the final amount changes but for now I'm hopeful that I've scored a bargain!