Cornish Jack
I do not want to sound over the top (Tin foil Hat firmly embedded in place) but given your reply and the fact that you have had problems with a succession of wireless routers - I had two BT Duds,
I suspect that the "strategic" facility that you mention; may be a factor in this situation. As a polite aside do you have similar problems in establishing mobile phone connectivity ?
In your case I'm thinking of the proximity of a Microwave link (I think these are used less now than in the past)
From personal experience I cite cell phone problems outside a well known building with limited occupancy issues in London. -
I know it sounds absolutely daft but it's one of those 1,000,000:1 chances that means you need wired connections in house.
If this proves to be the case, I suspect that you may be entitled to restorative modifications to enable you to "Enjoy" in the formal sense, your broadband connectivity.
Are there any PPruner's who have had recourse to this arrangement (confidentiality clauses permitting of course.)
CAT III