Hi Quash
I answered a similar post to yours last week.
As your husband was born before 8th April 1948 then you will not have to apply for PIP.
You need to contact DLA: 0800 731 0122 and inform them of a change of circumstances, have a look at our guides before contacting DWP,
www.benefitsandwork.co.uk/help-for-claimants/dla/#dlaclaims There are two guides for adults; one for Adults On Physical Health Grounds and the other for Adults On Mental Health Grounds.
If you have any further questions, please come back to the forum.
Gary