Thanks Ken for taking the time to respond and your helpful comments.
My set up is a Virgin Media router (with the Sonus about 30cm away) and I’m using the Sonos app on my iphone using iOS version 18.0.1. When I complete the install the app then displays - Your Ray has been added, but may not appear and you may nees to unplug your Ray’ When I do this it does not appear. Have tried factory resets etc
Is the Sonos Ray your one and only Sonos device? - if the answer to that is “Yes” and if you did factory reset it, then note that you must also reset the Sonos App too in order to create a new ‘Sonos Household’ to hold the speaker. You can’t use the original Household/App. So try a reset of both the App and speaker and create a ‘new’ Sonos system first before adding your speaker. Only do this however if it is your one and only Sonos product.
Also…
What model VM router is it? As one is mentioned on the Sonos ‘incompatibility’ list, albeit it may not be relevant if you only have the one Sonos product. See this link:
https://support.sonos.com/en-us/article/virgin-super-hub-3-compatibility