@1Gordo Don't worry I worked it out. For anyone else, my router 5Ghz channel selector was set at auto. I think some come with some standard channel settings eg 36 and 149. I set at 36 and suddenly...

Can anyone tell me if you can actually get a 5Ghz connection in client mode? I have tried a few things and when it scans, it picks up one other 5G network which looks like default (it never changes...