@Richardrw 

You can set up the Deco network to be the same as your current network. One thing to look out for is a device connecting to the furthest networking device even though there is a closer networking device. Sometimes a device wants to be connected to the network node further away giving an impression the signal coverage is really bad.

So if you notice your signal being weak, then I would make the network names different to avoid any confusion. 

@Tony thanks for the response.  I tried to find this post the other day to update it but couldnt find it.

This is exactly what I'm seeing now.  I realise I needed to give it a different name on initial set up but then once selected AP mode, I could give the network the same name as my router network.  However, as you say, if I select fast roaming, I find that my mobile devices switch between deco units fine, but when the closest signal is on the bt hub, it doesnt switch from deco to that unless signal drops completely.  So area in my house just sticks on 10% wifi strength on the deco despite being directly above the room where the bt hub is..

.. it doesnt seem to ever want to switch from deco to bt hub at all. I found it best to switch off my other decos when setting up static devices like my ring doorbell repeated and sky q mini boxes helped on initial set up.  So far it seems to be working ok, but I suspect I'll end up switching off the bt router wifi and relying on the decos.. it would just help if I had one more.

Also i wasnt sure if you can mix and match..?  I have three deco 5 units connected via switches and ethernet, not sure if I could have another just on wireless linking in AP mode?

Thanks

Richard 

@Richardrw 

You can mix any of the Deco models so if you have an existing M9 network, you can add an M5 via Wi-Fi.