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(i) Companies House is just an administrative record - your appointment as a director will only commence from the dated you actually consented;
(ii) No technically it would not be theft if his intention was to repay it. He would be personally liable to repay if the company went into an insolvency procedure;
(iii) Possibly, but it is unlikely - this is more likely to be pursued by a liquidator than dealt with as a criminal matter;
(iv) Yes holding yourself out as a director when you know you cannot be appointed as one because of your bankruptcy is potentially fraud;
(v) yes it is possibly fraud or theft - the threshold for fraud is very high, so it is unlikely this would be pursued. Theft is a more likely charged
(vi) If the company went insolvent then it is possible the liquidator could pursue the house. That said, if you want to claim a charge on the house as security for money owed you would need either a court order or his and his wifes consent;
(v) I would and see an insolvency practitioner immediately. Taking advice from an insolvency professional is the best way to protect against claims of personal liability in an insolvency. This can even be used as a defense in court.