Not too sure if there is anything you can do.
Did the Openreach engineers trespass on your property when these lines were installed. If so you then might have had a case.
Some legal beaver might have an opinion on this.
Do you think he might not be following this: https://www.gov.uk/run-business-from-home
According to the Openreach FAQ http://www.openreach.co.uk/orpg/home/contactus/wayleaves/wayleavesfaqs/wayleavesfaqs.do (see item 10) they may be allowed to run cables above your property without a wayleave.
If that does not apply, then they should have obtained a wayleave from you. You would need to take it up with Openreach (not the retail side of BT).
I'm not a legal beaver but as he is running a business in a residential area you could complain to the council about the restriction in your enjoyment of your residential property. You could ask your neighbour if he is intending to add more lines and also point out the existing obstruction of your view.
With regard to Ectophiles link it would be interesting to know what "and that they do not interfere with the normal business on the property." means - is normal business in your case the enjoyment of the view as it is a residential property ,if so then you can take it up with Openreach. Bear in mind that you will end up upsetting your neighbour as presumably you may want the wires removed ( if you don't sign a wayleave consent if indeed it is applicable).
How many phone numbers does he have to require 5 drop wires?
A Drop Wire 15 has 4 pairs, I would have thought they would have put them up instead of individual pair drop wires.
In reference to your predicament, you would need to familiarise yourself with the low flying wires act.
I think that would be schedule 2 of the Telecommunications Act 1984, as amended by the Communications Act 2003.
I don't think spoiling the view counts as:-
(b) any line which by reason of its position interferes with the
carrying on of any business (within the meaning of section 6
of this Act) carried on on that land.
Hi, Ive just seen your post, I have a major cable that joins two posts that runs ove my proerpty, I am about to buld a 2 story side extension but this cable is in the way!! this cable is more then 3m from the ground but is just under 2m from the corner of my house... could get openreach to move this foc?