E.S.A. to Pension

hi everyone,
I don't no if anyone can answer this as it's about becoming a pensioner and my husbands e.s.a. stopping. in January he was 65 but cannot get his pension until may, he is on e.s.a. at the moment but received a letter saying when he moves over to his pension he will have to make a new claim for housing benefit and pension credit but it also says if he has saving over a certain amount we cannot claim housing benefit. I have money in a trust that I cannot touch for another 7 yrs, does anyone no if this will affect our housing benefit even though I cannot touch the money, any advice will be gratefully received, thank you.