Hi em
Arrears of benefits; Arrears of benefits or ex-gratia payments are disgrgarded for one whole year after you receive them, after which they will be classed as savings.
If the arrears made to compensate for an official error or an error on a point of law are £5,000 or more, they can be disregarded until the end of your award of the means-tested benefit.
ESA Regs, Sch 9, para 11; IS Regs, Sch 10 para 7
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems