I'll be visting London In early October,so what type of clothing i have to wear, i gt a fleece. anything else?

Bring gloves and a knit cap. Bring comfortable sneakers, something in a waterproof variety and make sure they are broken in. Also for a jacket bring something warm that is also waterproof and make sure it has inside zippered pockets to keep your valuables. I would suggest wearing layers as the weather changes throughout the day. Mid-afternoon could bring either cold and wet, warm and dry, wet and warm, etc. Enjoy the trip!