Wayne
Pensions are treated separately from income and can affect the amount of ESA(CB) that is paid.
If your wife is only receiving ESA(CB) then only her pension can affect the amount that she receives, however, if she is also receiving an ESA(IR) top-up then both your pensions will reduce the amount payable.
The details of any Pension income would have been requested when she claimed ESA and when she was assessed for any ESA(IR), if she receives it.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
