What to bring

Warm clothes in case the weather turns [including a spare fleece and hat].
Waterproofs top and bottoms.
Wear trainers with a good grip or walking boots, climbing shoes if you have them.
A drink and maybe a thermos for a hot drink.
A packed lunch if you are doing activities all day.
Insect repellant.
Sun cream and a sun hat.
Something to hold your glasses on if you wear them.
Something to tie your hair back if it is long.
Personal medications.