Work experience happened in Y10 here too. DD spent a week with the local food bank and an associated charity, sorting food parcels, delivering them to housebound people, preparing recipe cards to go with them and processing applications. She loved it and it really opened her eyes to the world. She's quite the social warrior now!
I agree with PP that things like NCS, DofE, volunteering etc should be done if they will enjoy it, or if it will improve other life skills rather than only focusing on the PS for the UCAS form (medicine excepted.)
DD got a Saturday job at a local cafe the week after she turned 16. I actually think it's done more for her social skills, work ethic and CV than any of these other schemes. She has been trained on the fancy coffee machine, learned how to handle difficult customers, made friends with older kids who also work there and had to get up and get herself there every week. I think it will put her ahead of the pack when she gets to uni and needs to work there. I do worry that she loses one weekend day a week for revision because she is always shattered after 7 hours on her feet and just takes to her bed on a Saturday evening, but she doesn't do any other activity now - all sport and music were dropped by y9 so she really should be able to work around 7 hours a week.