Last update (I hope!). I fitted the HH6 on the 16/4/16 and everything has been very stable since with the laptop not attempting to connect to Bt-fon and the Airport express remaining connected to the HH too. I hope that is the end of it - my neighbour is bidding on a HH6 on eBay in the hope of resolving his wifi connection issues too. Thanks to all for your help on this one.
Last edited by yellowtriumph; 4th May 2017 at 16:45.