Using my Sonos (and other) equipment to create a surround sound system

Get rid of the Sony Soundbar, and replace with a Playbar/Playbase. Make sure it's directly connected to your router, and go through the steps to hook up one of your Connect Amps as rear surround sound speakers. If you can't do that, then get a Playbar/Playbase, get an extra Play 1 and set those up as wireless surround sound speakers.

There's no way to make the Sony Soundbar and Connect:Amp play nice with each other for surround sound.

To use a Connect:Amp to drive rear surrounds it is necessary to have a wired connection between the Playbar/base and C:A, either directly or through a router/switch. And you must run in boost mode. Play:1s may prove much easier practically.

Confused....my router is a ways away. No way to ethernet either Playbase or CONNECT:AMP to it. Can I just ethernet Playbase and CONNECT:AMP together?

Yes, as John B said. " a wired connection between the Playbar/base and C:A, either directly...."

I mentioned all of this in my original post. The Playbar/Playbase needs a direct connection to the router, along with the Connect:Amp (or a direct connection to each other). In your case if it's not possible, get a Playbar, and an extra Play 1 and use those as your wireless surrounds.

I cannot see that that was clear in your original reply, which is why I commented.

I wouldn't add Sonos into the mix here. If you're happy with your music system, keep it that way. If you are happy with your TV sound, don't change.

If you want a surround sound system for TV, Sonos is far from the best option here. Look at a modern TV sound system which meets your needs. It will likely offer more functions and be more cost effective than a Sonos PLAYBAR/Playbase.

RO53BEN, while that may be true, I already have the other SONOS components for the rear speakers. Adding the PLAYBASE seems like the logical solution if my TV is compatible. I am still trying to determine that.

RO53BEN, while that may be true, I already have the other SONOS components for the rear speakers. Adding the PLAYBASE seems like the logical solution if my TV is compatible. I am still trying to determine that.
I want to clarify one point. If you were using the Playbase to drive the Sonos Play1s (and/or a Sonos SUB) alone, that does not require a wired connection.

As far as playing music, the use of Playbase (and paired devices) doesn't preclude it from being used for the same music services you enjoy today. However, you may find it a little cumbersome if you wanted to say only use the Play 1s, as it would require removing them from the surround setup.

RO53BEN, while that may be true, I already have the other SONOS components for the rear speakers. Adding the PLAYBASE seems like the logical solution if my TV is compatible. I am still trying to determine that.

You can't use your existing Sonos components without buying an expensive PLAYBAR/PLAYBASE device.

Should you choose to do that, you can:

1) Waste a £1000 investment in Play 5 speakers (assuming they are gen 2) and use them as surround speakers. They can't then easily be used for music, unless used at the same time as your soundbar device - which doesn't work very well. It's your Play 5 speakers are Gen 1 they can't be used anyway.

2) Buy an additional PLAY:1 to use with the existing one as a surround speaker set-up. This will also cost £1000 and will only give you surround sound options from the 1990s.

3) Combine an existing Connect:Amp with existing speakers and combine with an £800 Sonos Soundbar. You'll need to wire the Connect:Amp device to your network and you'll only get surround sound options from the 1990s.

All three options above will lose the existing Sony Subwoofer, so you'll miss the rich bass you had previously. Your only option would be to buy a Sonos branded SUB, which can't be connected to anything else, at an additional cost of £700.

So you're looking at a £1500-1700 minimum to get a surround option from your existing components. You can buy a better surround sound AV solution for far less money than this and if you spent this much on AV separates, you'd rival the local cinema.