@ Black Sheep:
Being a long standing forum member/contributer can I firstly say that your response is very much appreciated, your knowledge is widely recognised and your advice is always freely given in a very courtious and uncondescending manner, thank you.
As stated at the outset, the FTTC/FTTP conversion was carried by an OR sub-contractor, in N.I. that happens to be "KN Circet".
Subsequent (requested) visit was by an OR engineer who basically agreed that the installation was "not ideal" but did very little other than re-pairing the Wi-Fi repeaters & phone, situation certainly not improved.
The onus is and always will be on the EU to give instruction as to where they want their service fitting, and as long as it's within OR scope that is what will happen. If your sister wasn't going to be available, why didn't she leave a note with her hubby to ensure no confusion existed, on installation day ??
To be fair, I think you are assuming an unreasonable level of knowledge on the system beyond normal expectation of the vast majority of EU's, surely that's why a technically competent person attends offering guidance on the best solution based on his or her knowledge and experience to produce a fit for purpose installation which is at least as efficient as the system it's replacing.
Is it fair to expect the EU to advise the engineer in attendance on the best location of the router (Hub) for most efficient Wi-Fi coverage?
Yes, my sister was not in attendance, would it have been any different if she was, she is not technically qualified to understand the system and appreciate that the router (Hub) would really need to be located in the same location as her previous FTTC router for Wi-Fi to have a chance of working throughout the house.
I intend to install a Cat-6 ethernet cable run from the ONT to the logical location for the router (Hub) through the roof space on Tuesday, day before the next scheduled OR visit, a 140 mile round trip for me to my sisters residence.
Do I think I should have to do this, no, but can see no other long term solution and can't see OR ever agreeing to undertake this activity.
The forthcoming OR visit, re-schedule from a no show last Friday, has been agreed (with BT) to be FOC, will see how things look on Tuesday after router re-siting before deciding on cancelling.
Should the visit go ahead for any reason I will be very, very displeased should any charge be levied and if so will advise my sister to contest vigorously through OFCOM if necessary.