Also down the line and i think i may have asked this before but can i double check a few things. After 5 years my american husband can get perm residence. I dont have too?
As an Irish citizen you do not have to live in the UK for 5 years to obtain permanent residence as all Irish citizen are regarded as settled, I believe.
You can also vote in the General Election as an Irish Citizen, so apart from personal reasons, there is no issue in no longer having British Citizenship.