If you are not then you will not be allowed on the coach. Wear suitable trousers not jeans. If it is warm enough for shorts in Durham, it may not be up in the mountains. So always bring some trousers and a spare jumper. It can be very cold in the Mountains of Britain even in the summer.
Chocolate bars are great for energy.
If you live in college packed lunches are available. This is for insurance purposes, for more info ask the Exec . Please make sure you have some warm clothing. An extra jumper, gloves and a hat are essential. Please be aware of your own physical capabilities, especially in the winter when snow makes the going much harder.