There are model units and exemplars on the website, which you probably know. I don't use either though now. I found the unit 4 a bit dull, so tried something new this year, which worked really well. To make the Unit 4 more exciting, I teach the Unit 4 and (part of) 11 together. Here I set them into groups, give them a £10 loan to get them started and then ask them to organise and run a one off event to raise money for charity. They have to write letters, carry out research, advertise, etc. Made it a lot more interesting for the pupils and relevant.