In Je-S, you should declare any relevant interests in a covering letter as part of your submission.
In the Funding Service, you should submit the covering letter separately as detailed in the specific funding opportunity.
Before submitting your application, you should refer to the declaration of interests (applicants) guidance.
The research councils’ Policy & Guidelines on the Governance of Good Research Conduct outlines the expectation that applicants for research council funding are expected to observe the highest standards of integrity, honesty and professionalism and to embed good practice in every aspect of their work.