After nearly 2 years with no help from bt with my fault which they admit is a network fault thier side btw my wife has been getting this warning on her iPhone. Not sure if its connected to the broadband fault... Advice please. "warning this WiFi network is blocking encrypted..."
Any advice would be great.
Usually you only get that warning if you are using a third party DNS that doesn't support encryption or using a VPN that doesn't either.
I had this recently. It is the BT a Web Protect turned on in your My BT settings on the web, turn this off and the message will disappear on the iPhone. The web protect filters DNS.
See https://community.bt.com/t5/Home-setup-Wi-Fi-network/BT-Hub6-Privacy-Warning-quot/td-p/2205865 particularly message 10 for solution.