Wireless guest isolation sees LAN clients

[PDilly]

I'm trying to isolate a wifi guest network from everything else on my network so that only internet access is available via my 8900.
I've ticked the guest client isolation box but everything is still showing up.
Does it only isolate wireless devices from each other on that guest network or have I missed an additional setting?
I also have a LAN connected wireless AP in my annex, set to the same guest SSID and pass phrase running on an isolated port and that's fine.
Any advice welcome

[PDilly]

Ignore my post
I had forgotten to add group isolation
Completely sorted now

[PDilly]

I tried setting up as planned and it nearly worked!
So I do need some assistance with what I want to achieve please.

Using only the 2.4ghz band, I need a single guest wifi network and a single private wifi/LAN network throughout my property
A LAN connected 3100SN will provide private Wifi in the lounge?
A second LAN connected 3100SN will provide guest wifi in our annex (I can group isolate the port on the 8900 that serves it).

What I haven't got to grips with is combining the isolated port with a further guest network on the 8900. It failed because the two were on different subnets

Can I group a LAN port together with a separate wifi network so that both one 3100SN and a guest wifi on the 8900 end up in the same subnet

I.e. My private network is 192.168.1.xxx and combined guest network is 192.168.2.xxx
Roaming from one subnet to another with identical SSID's was a nightmare.
Any help welcome.

[PDilly]

OK, have got all the network layouts sorted as needed
Guest and private LAN and WIFI networks isolated