 He is also close friends with many of his current and previous co-stars, including Harry Reid, Jacqueline Jossa, Lorna Fitzgerald and Tilly Keeper.Borthwick is a second cousin to his "EastEnders" co-star Charlie Winter, who played Hunter Owen.In January 2019 it was announced that he would be running the London Marathon with some of his "EastEnders" co-stars for a Dementia campaign in honour of Barbara Windsor.