the surestart maternity grant has a qualifyig factor of "no other children under 16" (im not sure why this is exactly) ? - its not like you would keep a cot for 16 years, or a pram that long or the baby grows ETC...
we actually gave most of our baby clothes away to others when our daughter didnt need them...
Housig benefit, is a possibility... whether you will get any i dontknow... worth a shot... remember to inform them if your wife has no recourse... - although it generally makes no difference... its better to let them know that way it cant go against your wifes ILR later on - just remember to get proof of whatever you send.
obviously though, housing benefit depends on your rent, the local authority rates in your area... what your entitled to (note: 2 bed once the baby is born, 1 bed place if just yourself and wife....