Problem is resolved. In the easy set up the wrong channel was being selected for 2.4ghz. I rang the Billion helpline, should have done this before, and they were very helpful, talked me through set up and hey presto laptop, phone etc can see the router.
As noted in previous posts my laptop won't currently support 5 ghz and for me to get this I either need a new wireless card or use the dongle that plugs into USB port.
A further query, should my Andriod phone be able to support 5 ghz, in settings only 2.4 ghz is visible?
Thanks
gom