Who is Rose Tyler?

Rose Tyler was driving back from Exeter and her car skids off the road near Broadchurch. She is taken to the local hospital and wakes to see a tall man with a scruffy beard sitting at her bedside. Rose has no memory of how she got there or who she is apart from her name. Alec Hardy takes her back to his chalet by the river and helps her get her memory back while her family arrive.