Hi Anneb,
Your son's New Style ESA group will be the Support.
As far as Council Tax is concerned the government allows every local authority in the UK to implement it's own Council Tax Reduction scheme. So you can find a large variation of conditions. A member from the Teignbridge area has just informed us that his Council Tax has increased on UC Migration owing to the Council's less favourable treatment of the UC LCWRA element. At the end of the day it's the decision of the local Council.
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems