Hello, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question.
I am of the opinion that to form a new company, I would suggest with no involvement of your brother, to undertake all existing business commitments is the way forward. You should advise The Registrar of Companies of the discrepancies you have discovered regarding your directorship on formation until your real appointment in October 2015. Then let HMRC take what action they deem appropriate regarding the original company in which you have had no managerial input until October 2015.
I do hope that you have found my reply of assistance..
It appears the best solution to an unfortunate situation. As a limited company is a separate legal entity to its shareholders and directors it is the company which is liable for the debts incurred not the individual.
Be careful not to remove cash or items with a resale value without compensation as this would constitute a fraudulent preference if HMRC were left short and a fraudulent preference is a criminal offence. Having said that I am aware of a company which had a large stock of parts for old buses which the receiver declared valueless so the directors removed them with permission. They were actually worth many thousands of pounds!
I am of the opinion that you should take trusted, local professional advice before embarking on such a project.
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Thank you for your support.