Hi winwin,
Question 1 - Yes.
Question 2 - Your husband can only transfer marriage allowance when he has 10% of his personal allowances to spare.
Personal allowance is the first of your allowances to be used.
If your husband's savings interest income exceeds £11,321, he cannot transfer marriage allowance.
If he needs to cancel the transfer, he can do so here:
Marriage Allowance
Thank you.