Paul Martin says his only option is to "dismantle the cottages and render them unhabitable".
Welsh Conservative leader Darren Millar said only his party offered Welsh voters "real, credible, positive change".
One head says teachers are coming into the job and only lasting a year or two before leaving.
Janet Finch-Saunders officially sanctioned after investigation by the parliament's standards watchdog.
Senedd members to be asked to reprimand Janet Finch-Saunders next week.
It follows arrests on suspicion of spying last week of three men with Wales and Labour connections.
Three men with connections to Wales and the Labour Party were arrested on suspicion of spying.
BBC specialists look at promises to cut taxes, ban phones in schools, build roads, and declaring a health emergency.
The Conservatives say its income tax pledge could save an average working family £450 per year.
