I don't know whether your husband filled in the income-related part of the ESA1, but if he did and your husband couldn't qualify on his contribution record, or if your combined income/capital exceeded the statutory amount as defined by law to be able to qualify for income-based ESA, it is possible he may not be entitled to any of this allowance?
However, it may be in your best interests to obtain advice from a CAB or welfare rights office, to see if your husband may be entitled to any other social security benefits?
Nothing on this board constitutes legal advice - always consult a professional about specific problems