Hi A-nobody
Some Councils are using UC Migration as an excuse for raising Council Tax on Benefits claimants. This varies from Council to Council. You could try using a Benefits Calculator such as Entitledto.co.uk to generate a Council Tax figure.
You will need to inform the Council of the move to UC when you get your first UC payment.
I know of one Council that is forcing people to apply for Council Tax assistance from scratch after Migration including providing ID. I think they are making life difficult in the hope that some people won't bother to claim at all.
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems