Clothes and feet
The clothes you bring heavily depend on the time of year that you do the expedition, so I recommend looking online (at the location where you’re doing the expedition) to further guide you with what to bring.
I wore the same type of clothing when I did the expedition: sports t-shirts (NOT cotton), fleece, leggings, tracksuit bottoms. The quantity of what you’re bringing depends on which level you’re doing as the length varies.
DofE is famous for giving everyone blisters. I’m aware that as someone with type 1, I could be more susceptible to foot problems, so I made sure I looked after them while walking long distances on consecutive days.
I really appreciated having good-fitting boots and socks specifically for walking because walking with a blister for multiple days isn’t an enjoyable experience!