Essentials

Waterproof Jacket
Layers of thin stretchy clothing (preferably not cotton)
Gloves
Hat
Small Rucksack to contain
Lunch
Hot drink
Cold Drink

Suggested items - For your comfort

Thermal underwear
Waterproof trousers
Fleece
Spare hat, gloves and socks
Snacks
Goggles/sunglasses
Sun cream