Settlement for spouses runs in this order:-
1. Application for settlement is made by applicant on the basis of their mariage with a UK national
2. Spouse visa granted to applicatoin for a period of 27 months (ie. it expires 27 months after it was granted).
3. 24 months after the initial visa was granted the applicant can apply for indefinate leave to remain only with the support of his wife, who should state they are still married.
4, After ILR has be granted the applicant can then wait a further 12 months so that their total time in the UK is 3 years and then apply for citizenship.
In summary if your husband has not received ILR yet then you can restrict his ability by doing so by advising the UKBA of the breakdown of your marriage. They will curtail his visa so that his leave to remain ceases. You can then advise them if he does not leave and tell them where he is available to be found to deport. It is up to the UKBA to actually deport him though, ultimately it is their decision.
If you do not comply with his request to support his ILR application with your documents then he will not receive ILR.
If he has already received ILR then there is nothing you can do. He will have the right to apply for citizenship.
I trust this clarifies. If so please click accept.