Good coverage of that here:
Early Briton had dark skin and blue eyes
And here's a pic:
Early Briton had dark skin and blue eyes
Cheddar Man's genome reveals he was closely related to other Mesolithic individuals - so-called Western Hunter-Gatherers - who have been analysed from Spain, Luxembourg and Hungary.
Pale skin probably arrived in Britain with a migration of people from the Middle East around 6,000 years ago. This population had pale skin and brown eyes and absorbed populations like the ones Cheddar Man belonged to.
And here's a pic: