As Britain gets ready for Brexit, businesses up and down the land have some big questions. Who the UK trades will define whether the biggest political decision in a generation is a success or not. It could herald a new age of prosperity in a globalised economy, but failure would mean the entire nation could end up poorer. Julie Etchingham explores the opportunities and obstacles for Britain as it prepares to leave a trading block which it has been part of for nearly 50 years.