Hi RobertoS, you have a very good memory, yes you are correct!
I will in the next few days may be take one or two photos of installation and explain further what the difficulties and results were. In the meantime this is what we decided that the best method to get internet to the remote building was by installing two Ubiquiti NBE-5AC-16 NanoBeam AC Outdoor 5GHz 16dBi WiFi Point-to-Point Link Kit (450Mbps AC) mounted on J poles.
We played with the idea of suggestions from members of this forum to extend a cable on catenary wire from one building to the other but it meant having to dig a small trench on a tarmac drive and a block paved area at the entrance to the remote building to drive ground rods to connect the surge protectors for the Cat6 cable and the catenary wire as there was no easy way to connect the ground wires.
On advice from CS at Ubiquity (USA) the Ubiquiti NBE-5AC-16 NanoBeam did not need to be grounded as the NanoBeams have protection against ESD within its circuitry, so the powers to be decided to install the NanoBeams. That was one issue solved, the second issue has been as my post above we have been unable to purchase RJ45 shielded modular plugs that the shielded Cat6 cable pairs would fit into the holes! We purchased from three different sources in Amazon, some very expensive ones but to my disappointment none fitted the Cat6 shielded pairs! If anyone here knows where I could lay my hands on proved RJ45 shielded modular plugs that will fit the cat6 pairs I would appreciate if they could let me know. As a consequence I have had to use Cat6 UTP cable in flexible conduit.
The only issue now is that I will have to rerun the cables in one particular room to distance the cables further from fluorescent light fittings as when the lights are on the download speed drops fro 16Mbps to 1.6Mbps!
Diagram of the installation (bear in mind that the cat6 cable is now UTP and not shielded)!; https://s19.postimg.org/r7ntbcgrn/Amended_diagram_af...
Edited typo.

Edited by deleted (Sun 15-Oct-17 13:08:55)

As stated in my previous post here are photos of the actual installation of the Ubiquity NanoBeams.
Position of the access point radio;
https://s19.postimg.org/upr2zih83/P1000413.jpg

Position of the station radio 30m from the access point radio;
https://s19.postimg.org/9hdei7ksj/P1000414.jpg

Electrical cupboard in the remote building where the POE injector for the station radio is situated. I have not noticed any issues with between the injector and the electrical equipment and the download speed at this position is a steady 16Mbps.
https://s19.postimg.org/v3sezm1gz/P1000411.jpg

This is where the issue arises but only when the fluorescent lights are switched on the download speed goes from 13/16Mbps to 1.6Mbps but not when the lights are switched off! I will re-rote the cat6 above this ceiling as far away from the light fittings as possible to solve the issue.
https://s19.postimg.org/gojorx89f/P1000412.jpg

This is a really interesting thread! But some aspects I find confusing...

In reply to a post by scopio:

having to dig a small trench on a tarmac drive and a block paved area at the entrance to the remote building to drive ground rods

I've never had to dig a trench to drive in a ground rod before, only whack them in using the pointy end. Maybe you'd have to remove a brick from your paved area or drill a pilot hole through tarmac but a trench? Is the trench to re-discover/check for soil pipes?

In reply to a post by scopio:

On advice from CS at Ubiquity (USA) the Ubiquiti NBE-5AC-16 NanoBeam did not need to be grounded as the NanoBeams have protection against ESD within its circuitry

Based on the MikroTik kit I've installed I thought the grounding of the J tubes was for lightning protection and separate to the (remote) grounding of the cat6 cable for RF interference reduction? The NanoBeams might have ESD protection but if the J poles aren't grounded then surely this just shunts the issue to the cable thus potentially destroying the kit at the other end of the cat6 cable? I guess I'm surprised to hear the opposite advice from Ubiquity than from MikroTik.

In reply to a post by scopio:

the second issue has been as my post above we have been unable to purchase RJ45 shielded modular plugs that the shielded Cat6 cable pairs would fit into the holes! We purchased from three different sources in Amazon, some very expensive ones but to my disappointment none fitted the Cat6 shielded pairs! If anyone here knows where I could lay my hands on proved RJ45 shielded modular plugs that will fit the cat6 pairs I would appreciate if they could let me know.

I'll go search my emails for purchase history but in the meantime, if it helps, the ones that worked for me were 2-part with pre-loading guide.

Having tried all three methods, suspended wire, wireless link and buried cable, I've had best results with buried cable followed by suspended wire generally because there's no on-going maintenance like trimming trees and RF interference.

Keep posting with updates please!

I have posted in different forums including Ubiquity Forum where the regular and experienced installers of these equipment often post trying to clarify the need to ground these two NanoBeams and whilst it is recommended if the radios are fitted on a mast for my situation where the J poles are only 20 inches long and 3 meters off the ground driving a ground rod seems an over kill. After all there are 100,000s if not millions of TV aerials and Digital dishes on the top of buildings all over the country which have no surge protectors or grounding which are more likely to be hit by a direct lightning strike for which there is no protection. Fitting a lightning protector would only protect from the high energy bursts. The only advice that I had was to connect the lightning protector to the earthing block in the consumer unit if I was that worried about lightning strikes.
As for

having to dig a small trench on a tarmac drive and a block paved area at the entrance to the remote building to drive ground rods

The grounding is as you say for protecting the J poles but also the radios and the equipment beyond as the lightning protectors have two RJ45 ports, one from the radio to the protector and one from the protector to the LAN. The shielding cable is for RF interference reduction and nothing to do with lightning protection. Of course these manufacturers sell lightning protectors and they would advice the fitting of them to make a sale!
The grounding rod would have to be driven at least 12 inches away from the building wall in order to avoid hitting the foundations and then again there are sewage pipes that may be running where the rod is to be driven, although in my case other services such as water, gas and electrical services are well away from where the rods would have been driven. Had I driven a ground rod and the reading would not have been favourable I would have to drive extra rods 6 feet apart with inspection covers and a trench to join the rods and run the earth strap/cable to the lightning protectors.
Whatever we do nothing is going to protect anything from a direct lightning strike all we can do is try to protect the equipment from a lightning burst or take a risk and hope that the lightning strike is miles away from us.