When did the first humans arrive in the British Isles? Weren’t the Isles connected to Europe 10,000 years ago due to lower sea level?
Hundreds of thousands of years ago.
9,000 year old Cheddar Man is related to my dad's mother (DNA U5a). There is also a 23,000 year old Cheddar Man but, we don't know much about him.
The earliest known cave paintings in Britain (Nottinghamshire) were made about 13,000 years ago, and the more durable artifacts are arrowheads, spearheads, and axeheads, the oldest of the latter being much older than this cave painting.
http://www.freerepublic.com/focus/news/986733/posts
http://www.freerepublic.com/focus/news/1091680/posts?page=38#38
http://www.freerepublic.com/focus/fr/1357365/posts?page=43#43
http://www.freerepublic.com/focus/news/1696581/posts
http://www.freerepublic.com/focus/news/1711701/posts