Wayne
I'm afraid being in the Support Group does not exempt a claimant from further assessment but three ESA50s in six months is excessive as it implies that that prognosis from each assessment is only for the minimum three month period.
Either there is a significant expectation of your wife's conditions changing or her condition(s) do not warrant a longer period.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
