You should have set up an ssid password which should keep others out. On my netgear router on the setup pages there is a way of turning off the wireless signal when not required. Not got a bt home hub so cannot help for that.
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation techniques
How to mine Bitcoin on Mac
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.