Your lawyer should of given you instructions on how they like it executed but anyway as a suggestion
sign your name, print your name and write as attorney for or under power of attorney for your husband's full name,
here is the legsln
Powers of Attorney Act 1998 s 69(1) . An instrument must be executed in a way showing the attorney executed it as attorney for the principal: s 69(2) . An instrument executed in accordance with s 69 is as effective as if executed or done by the principal with the principal's signature or signature and seal, or in the principal's name: s 69(3)