Personally, I'd be far more worried about the possibility of being 'caught out' by the Company Records Office than disclosing your recent past to your current employer.
The CRO's job is to identify your 'track record' as a director, in order to prevent those kind of 'phoenix' companies which rise from the ashes of the last failure (which left Revenue and creditor debts outstanding) with the same directors. As this is not what happened in your case, I don't think you really have any problem here.
However, if the CRO were to return your directors form to your Company Secretary with a note saying 'Would this be the same Liam who was a director of xxx company?', this is FAr more likely to raise serious questions. Your attempt to hide or cover up your past will mean that your new employers will assume the worst case scenario.
I'd strongly recommend that you come clean with your new employer.