There are a number of director's duties that apply to limited companies contained within the Companies Act 2006.
1. To act within powers.
2. To promote the success of the company.
3. To exercise independent judgment.
4. To exercise reasonable care, skill and diligence.
5. To avoid conflicts of interest.
6. Not to accept benefits from third parties.
7. To declare an interest in a proposed transaction or arrangement.
Duties 2,3,4, 5 and 7 would come into play.