The concept of a banded property tax was always a bad idea. It is rough justice and there were well over a million appeals against the initial valuations. To introduce a superband, even as an interim measure, would only compound the problem and could provoke the kind of "constructive vandalism" - partial demolition - adopted as a means of avoiding liability under the business rate. This would be particularly serious because many higher-value houses are historic buildings.
There is no really satisfactory interim remedy for the deficiencies of the council tax and thorough-going reform is needed. The fairest and most practical solution would be to shift to assessments based on site values - the annual rental value of the land. This is the simplest system to administer and does not penalise development or improvement - a major drawback of the council tax, the uniform business rate and the old rating system; if the owner of a shed replaces it with a well-appointed modern building, the reward is higher tax bills.
Brighton, East Sussex