I want to change my surname to double barrel it. I’ve looked up cost and know I need to change my passport but I wonder how easy it is after that. Do you change birth certificate? Once you’ve changed it by deed poll is it easy to change with bank etc? If I choose not to officially change it can I just start using another name at work etc? Any experience or help welcomed - I’ve looked it up but it only tells me the initial first steps to take. Thanks 