well first to answer your question, openreach are the ones who will own the installed fibre and be able to sell services again and again on that fibre for the life of the fibre. That is a pretty big reason why they should pay for it. Its a bit like me buying a car but then having to pay to rent it out as well.
Complete nonsense. If you go to any utility company and ask them to provide a new service, they will check whether the existing infrastructure can support this. If it can't and new infrastructure is needed, they will charge for it.
I see its now been explained that costs are apparently much higher when its under a carriageway. I never suggested openreach are ripping someone off (by charging excessive amounts per the cost to themselves), but rather than it seems there is improvements still to be made in efficiencies.
Where can there be improvements in efficiencies? If the OP went to a public work's contractor and ask for a quotation for the work to be done, I can almost guarantee it would be significantly more expensive and he wouldn't get the £1,000 contribution from Openreach.
Just install that 36m overhead if the underground cost is excessive.
It's not that simple. Planning regulations restrict the use of overhead cables in many areas now, so this is likely to be an issue.
Also, I doubt the home owners in the neighbourhood would be particularly happy with the sudden installation of multiple telegraph poles outside of their properties.
Also why is digging up even required? if they have proper underground infrastructure already in place which is well maintained (which it should be), then the fibre can simply be pushed, pulled or blown through.
Ducting has only really been used in the last 20-30 years for new properties. Before then it was common to lay telecoms cable directly in the earth.
Even new builds, some developers have laid cable directly in earth (presumably to save cost).
If it were me I wouldnt even consider paying thousands for infrastructure in which I have no ownership claim to, if the FTTP was essential I would consider installing my own FTTP cable instead that I own (since I am paying the full cost anyway for the works) and then leasing that cable back to openreach or another telco which could be used to provide broadband services on.
How would you install your own FTTP cable in a public road? The council would never allow this.
If it's private land, then it's a different story and Openreach do allow people to install ducting to their specification. However, when it comes to carriageways, there are a whole list of reasons why a council would never let someone randomly start digging to install ducting and a fibre cable.