Neil Simmonds  Freshman Member

Completely forgot to reply to this but just to say thanks for the answer, that led me in the right direction and the realisation that the issue was at the router which doens't support Vlans. The GS1200 went back to amazon and I added a wifi repeater to allow me to connect the dvice I wanted to isolate to the guest wifi. 

I should have mentioned, The router connects to Port1 of the GS1200 and nothing else so all traffic goes through the GS1200