As soon as your peer-reviewed manuscript has been accepted, upload it. The REF Open Access policy requires manuscripts to be uploaded no later than three months after acceptance.
Ideally you should upload the manuscript, or contact us, before signing a Copyright Transfer Agreement or choosing an Open Access option on the journal website. If you need to pick an Open Access option or sign a copyright form when you submit your paper to a journal please let us know. We'll be able to advise you which options to pick and provide an in principle decision on Open Access funding.