Ethics approval and consent to participate
We confirm that all methods were carried out in accordance with relevant guidelines and regulations. This manuscript reports results from the REtirement in ACTion (REACT) Study, registered as a randomised controlled trial (ISRCTN, ID:ISRCTN45627165) and approved by the National Health Service (NHS) South East Coast-Surrey Research Ethics Committee (15/LO/2082). Written informed consent was obtained from all participants in the REACT study including written informed consent for the audio-recording of interviews which was the main data collection for this study.