Why are you using S1 and S2 versions of the App. The products you named are all S2 compatible. Click the link

https://support.sonos.com/en-us/article/sonos-app-version-compatibility

If you have previously downgraded any Speakers to S1 you will have to factory reset them to make them S2 compatible.

try sonophone app ios £4

Are you suggesting that I download this app and remove all of the other Sonos apps and start again?

Nope this works independently, additional app, keep all your sonos apps, it uses old tech way to control your sonos speakers 

Money refunded if not happy

How do the different apps work with each other and why do they not conflict in any way?

Its just a controller app using your local network, doesn’t go to the sonos servers, less delays. It basically finds your sonos players and send urls to them, cant set anything up in it. Been around years well trusted

I will take a look, thanks.

Is this the one developed by Stefan Hansel “SonoPhone for Sonos”

“Conflict” would be a strong comment in this case. Different controller Apps might offer more or less features than the others. Music play is done by the players. Once the music is started the controller can be shutdown.

The situation is different if you are using a music service application, possibly streaming to a player via Bluetooth or AirPlay 2. In this case the player App is usually managing play directly. Multiple applications can be installed on the phone/pad/computer, but it would be a good idea to run only one App at a time.

Yes exactly, stephan is active in the sonos facebook groups, very nice bloke as well, he has said if you are not happy with it he will give your money back

Thank you very much for you patience and help, I have downloaded and am learning how to navigate the app.  Much appreciated.