Hello @billybland
Thank you for being interested in Kasa switches.Kasa switches.
If you need a two-way switch ( 1 switch control 1 light ) for now, the Kasa two-way switch HS200 or a dimmer switch HS220 requires a neutral wire to provide power to the switch itself.
If the Neutral Wire is not present, the HS200 or Kasa two-way switch can Not be installed.
For the three-way switch like HS210Kit, a neutral wire is also required on the main HS210.
You may need an electrician to change the wiring in the wall box or consider other products, hope this helps when you are looking for a switch.