Equipment to be carried:
Lunch and food. For a day hike you will need a packed lunch, with a drink. You will perhaps also like to bring some snacks to eat while you are on the hike, for example a bag of sweets. Depending on the weather, a flask with a hot drink in is a good addition. Also carry some 'Emergency Rations', such as chocolate, which you will keep until the end of the journey, unless you have an emergency.
Drinks. You will need to bring drinks with you, depending on the weather, but about 1 litre would be a good quantity for a full day (Its better not to have fizzy drinks).
Money. We may be stopping in a town or village for a break so maybe you would like to bring some money for an ice cream, hot drink or other refreshments.
Personal First Aid Kit. Some Scouts like to have a personal first aid kit, to treat minor injuries they might sustain themselves (such as a blister). These can be bought cheaply from chemist shops (e.g. Boots), or outdoor shops. Perhaps it could contain a selection of bandages, and elastoplasts, a note book and pencil and coins for a phone box. There should be a more comprehensive first aid kit carried in the group as well
Spare Clothes. So that you are equipped for a range of circumstances. In even hot weather it can be cold on hillsides so a long sleeve top is a good idea. Spare socks are useful in case you get your feet wet.
Gloves. If the day looks like it will be cold bring gloves.
Hat. There can be a great temperature difference between lowland and the top of the hills, because of this hats are useful. Most heat is lost through your head so a hat will reduce this. In hot weather, a baseball cap or similar will reduce things such as dehydration and heatstroke.
Sun tan lotion depending on the weather
Map, Compass, Whistle, Polythene Bag (Survival Bag), Torch with Spare Bulb and Batteries. For a short hike the group leaders will normally carry these, however if you have room in your rucksack, they are useful additions. The map, compass and whistle are useful if you get split up from the group and the survival bag in case of emergencies where you have to stop walking.
Rucksack. You will need one of these to carry your other equipment in. The leaders have a limited number of small rucksacks that can be loaned to Scouts but not many. If you are buying one, they come in sizes measured in litres, 25 to 30 litres would generally give you enough space. Make sure they are comfortable, and if possible with a padded waist strap. Line the rucksack with a plastic bag to keep your equipment dry, no rucksack is 100% waterproof

Equipment to be worn:
Walking Boots. The terrain we will be walking along can be uneven and footwear which has ankle support is best. It will be possible to do the walk in trainers but there is a greater risk of an twisting an ankle if you are wearing trainers.
Waterproof Jacket (and trousers). You will need a waterproof jacket, even if it looks like the day will be warm, it can always be carried in a rucksack. A waterproof jacket should also be wind proof, "Wind Chill" can contribute to cold related problems, such as hypothermia, so stopping the wind is important.
Clothes. Air is a good insulator and the principle of keeping warm on the hills is to wear lots of thin layers of clothes to trap air and keep you warm. For example, wear a vest / thin T Shirt, then a thicker T shirt, then a long sleeved T Shirt, a jumper, a fleece jacket then a waterproof jacket to keep you warm on a cold day, remembering to wear a hat. You can take off some of these layers as you get warmer. Always take a long sleeved top and a waterproof and windproof jacket. Cold and wet are 2 major factors to cause problems with the cold, such as hypothermia, a jacket can stop this. Jeans and denim clothes are hard wearing, but when they get wet, they are allow the body to get very cold, quickly and it is best not to wear them when walking. Socks are an important consideration. Make sure they are comfortable. Many people use 2 pairs when wearing walking boots to prevent blisters. In warm weather it would be OK to walk in a T shirt and pair of shorts or light trousers, but make sure you carry warmer clothing in your bag. In hot weather, a baseball cap would be good to keep you cool, and thin long sleeved top and trousers to prevent sun burn and sun stroke.