What is a cockney slang for husband?

There isn't one specific, universally accepted Cockney slang term for "husband". Cockney slang is often based on rhyming slang, and the term "husband" doesn't lend itself to a simple rhyming phrase.

However, you could use rhyming slang phrases like:

* "Old Man" - "Old Man" could be used to refer to a husband, as it rhymes with "plan" which is then used as "plan your trip" or "plan your holiday".

It's important to remember that Cockney slang is constantly evolving and not all terms are universally understood.