Maybe best to be upfront about your husband previously being self-employed... if only for the sake of keeping the record straight.
Can't do any harm mentioning it ...and it is always as well to be on "the safe side" - in case the ECO dealing with your fresh application decides to undertake any past checks ... which he/she [possibly] could do!
Good Luck ... as long as you're able to comply with all the requirements this time around ...... I'm sure everything bodes well for success.
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