thank you for the help and advice so far everybody.
https://www.amazon.co.uk/NETGEAR-5-P...dp/B07QF51CVQ/
What I'm after is Ethernet isolation. A bit more searching shows 'Private VLAN' may be the words i'm after
Would something like this allow me to create Guest VLANS, which for example if a Guest computer was ethernet connected in to a Guest VLAN Port, they cannot carry out miscellaneous tasks such as Sniffing the network etc?