OK, I've had 24 hours to recover.
As far as I can determine, and it wasn't easy, the phones themselves don't tick. I called in from my mobile, and got an absolutely clear line on each of the 3 phones in the flat. Auntie wouldn't let me borrow her lifeline button thingy to test whether that is causing the interference. So no progress made. She says you only get the ticking when the call is coming from outside the block of flats, and that all calls from neighbours and staff don't tick. Since she doesn't actually ever speak to the neighbours, and the staff call via the intercom, this doesn't help any. She also says it was BT who said it must be interference from another flat, but then (in my experience) they'd say anything to avoid actually coming out and doing something.
The main purpose of my visit was to transport her ladyship to the Audiology clinic so they can review how she has coped with the hearing aids she got 3 months ago. Pointless, really, since she's never actually bothered to use them. Anyway, she told the Audiologist that she didn't need them as she could hear perfectly well without them. The Audiologist, a saint, in my opinion, gently pointed out that in order to communicate with Auntie, she (the Audiologist) was shouting at the top of her voice, as, indeed, I had had to do all afternoon. Auntie was persuaded to have another try, and we were able to talk at a reasonable volume thereafter. Naturally, as soon as we got back to the flat, Aunti removed the aids, and I doubt if they will ever be used again. Don't know why I bothered, really.
A question: why does the traffic in Hendon contain a much higher percentage of 4x4s than the traffic in Suffolk, a place where they might actually come in useful now and again?
And the ticking? I suspect there's a geiger counter somewhere, and Auntie has turned radioactive.
