OK, time for an update, sorry for the delay.
The last position was:
I had powered off/on the home hub.
BT (In India) said they had reset my connection - although I'm not clear what this means.
I had changed the wifi channel manually to be channel 11.
I have gone into the BTWifi-with-FON connection properties (under properties>connection) and unticked the box marked 'Connect automatically when this network is in range).
Since then the laptop, which is always physically in the same place, has not connected to the Fon signal, and, the Apple Airport express now sits with a nice green light on which is indicating it is happy with its wifi (and hence internet?)connection.
I suppose this is good news of some sort and I am tempted not to do anything further for a suitable test period. I have had a replacement HH5 delivered. Any further thoughts from the team?
Last edited by yellowtriumph; 13th Apr 2017 at 13:01.