What are the implications for the director where loans provided by the Director to the company are not in writing or any way ambiguous?

Unless the loan is in writing in an unambiguous form on taking of civil proceedings these loans are not deemed to be loans (S.237(3) Companies Act 2014) and where it is proven in civil proceedings that a loan exists, then it is assumed that they bear no interest and are subordinate to all other debts in the company.